Can i join a list in sub-site using Join query?

Hi all,
I'm newbie and i have tried to join a list in parent site with a list in sub-site using Join query but i always get the error. How can i do this action? Thanks!

You could try using SPSiteDataQuery or a DataTable.
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spsitedataquery%28v=office.14%29.aspx
http://sharepoint.stackexchange.com/questions/75713/is-it-possible-to-populate-result-by-joining-two-lists-throughout-the-site-colle
--Cheers

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    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Runtime.InteropServices;
    using System.Net.NetworkInformation;
    using System.Threading;
    using System.Text;
    using System.Diagnostics;
    namespace NativeWifi
    /// <summary>
    /// Represents a client to the Zeroconf (Native Wifi) service.
    /// </summary>
    /// <remarks>
    /// This class is the entrypoint to Native Wifi management. To manage WiFi settings, create an instance
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    /// </remarks>
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    #region P/Invoke API
    /// <summary>
    /// Defines various opcodes used to set and query parameters for an interface.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>WLAN_INTF_OPCODE</c> type.
    /// </remarks>
    public enum WlanIntfOpcode
    /// <summary>
    /// Opcode used to set or query whether auto config is enabled.
    /// </summary>
    AutoconfEnabled = 1,
    /// <summary>
    /// Opcode used to set or query whether background scan is enabled.
    /// </summary>
    BackgroundScanEnabled,
    /// <summary>
    /// Opcode used to set or query the media streaming mode of the driver.
    /// </summary>
    MediaStreamingMode,
    /// <summary>
    /// Opcode used to set or query the radio state.
    /// </summary>
    RadioState,
    /// <summary>
    /// Opcode used to set or query the BSS type of the interface.
    /// </summary>
    BssType,
    /// <summary>
    /// Opcode used to query the state of the interface.
    /// </summary>
    InterfaceState,
    /// <summary>
    /// Opcode used to query information about the current connection of the interface.
    /// </summary>
    CurrentConnection,
    /// <summary>
    /// Opcose used to query the current channel on which the wireless interface is operating.
    /// </summary>
    ChannelNumber,
    /// <summary>
    /// Opcode used to query the supported auth/cipher pairs for infrastructure mode.
    /// </summary>
    SupportedInfrastructureAuthCipherPairs,
    /// <summary>
    /// Opcode used to query the supported auth/cipher pairs for ad hoc mode.
    /// </summary>
    SupportedAdhocAuthCipherPairs,
    /// <summary>
    /// Opcode used to query the list of supported country or region strings.
    /// </summary>
    SupportedCountryOrRegionStringList,
    /// <summary>
    /// Opcode used to set or query the current operation mode of the wireless interface.
    /// </summary>
    CurrentOperationMode,
    /// <summary>
    /// Opcode used to query driver statistics.
    /// </summary>
    Statistics = 0x10000101,
    /// <summary>
    /// Opcode used to query the received signal strength.
    /// </summary>
    RSSI,
    SecurityStart = 0x20010000,
    SecurityEnd = 0x2fffffff,
    IhvStart = 0x30000000,
    IhvEnd = 0x3fffffff
    /// <summary>
    /// Specifies the origin of automatic configuration (auto config) settings.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>WLAN_OPCODE_VALUE_TYPE</c> type.
    /// </remarks>
    public enum WlanOpcodeValueType
    /// <summary>
    /// The auto config settings were queried, but the origin of the settings was not determined.
    /// </summary>
    QueryOnly = 0,
    /// <summary>
    /// The auto config settings were set by group policy.
    /// </summary>
    SetByGroupPolicy = 1,
    /// <summary>
    /// The auto config settings were set by the user.
    /// </summary>
    SetByUser = 2,
    /// <summary>
    /// The auto config settings are invalid.
    /// </summary>
    Invalid = 3
    public const uint WLAN_CLIENT_VERSION_XP_SP2 = 1;
    public const uint WLAN_CLIENT_VERSION_LONGHORN = 2;
    [DllImport("wlanapi.dll")]
    public static extern int WlanOpenHandle(
    [In] UInt32 clientVersion,
    [In, Out] IntPtr pReserved,
    [Out] out UInt32 negotiatedVersion,
    [Out] out IntPtr clientHandle);
    [DllImport("wlanapi.dll")]
    public static extern int WlanCloseHandle(
    [In] IntPtr clientHandle,
    [In, Out] IntPtr pReserved);
    [DllImport("wlanapi.dll")]
    public static extern int WlanEnumInterfaces(
    [In] IntPtr clientHandle,
    [In, Out] IntPtr pReserved,
    [Out] out IntPtr ppInterfaceList);
    [DllImport("wlanapi.dll")]
    public static extern int WlanQueryInterface(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] WlanIntfOpcode opCode,
    [In, Out] IntPtr pReserved,
    [Out] out int dataSize,
    [Out] out IntPtr ppData,
    [Out] out WlanOpcodeValueType wlanOpcodeValueType);
    [DllImport("wlanapi.dll")]
    public static extern int WlanSetInterface(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] WlanIntfOpcode opCode,
    [In] uint dataSize,
    [In] IntPtr pData,
    [In, Out] IntPtr pReserved);
    /// <param name="pDot11Ssid">Not supported on Windows XP SP2: must be a <c>null</c> reference.</param>
    /// <param name="pIeData">Not supported on Windows XP SP2: must be a <c>null</c> reference.</param>
    [DllImport("wlanapi.dll")]
    public static extern int WlanScan(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] IntPtr pDot11Ssid,
    [In] IntPtr pIeData,
    [In, Out] IntPtr pReserved);
    /// <summary>
    /// Defines flags passed to <see cref="WlanGetAvailableNetworkList"/>.
    /// </summary>
    [Flags]
    public enum WlanGetAvailableNetworkFlags
    /// <summary>
    /// Include all ad-hoc network profiles in the available network list, including profiles that are not visible.
    /// </summary>
    IncludeAllAdhocProfiles = 0x00000001,
    /// <summary>
    /// Include all hidden network profiles in the available network list, including profiles that are not visible.
    /// </summary>
    IncludeAllManualHiddenProfiles = 0x00000002
    /// <summary>
    /// The header of an array of information about available networks.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    internal struct WlanAvailableNetworkListHeader
    /// <summary>
    /// Contains the number of <see cref="WlanAvailableNetwork"/> items following the header.
    /// </summary>
    public uint numberOfItems;
    /// <summary>
    /// The index of the current item. The index of the first item is 0.
    /// </summary>
    public uint index;
    /// <summary>
    /// Defines the flags which specify characteristics of an available network.
    /// </summary>
    [Flags]
    public enum WlanAvailableNetworkFlags
    /// <summary>
    /// This network is currently connected.
    /// </summary>
    Connected = 0x00000001,
    /// <summary>
    /// There is a profile for this network.
    /// </summary>
    HasProfile = 0x00000002
    /// <summary>
    /// Contains information about an available wireless network.
    /// </summary>
    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
    public struct WlanAvailableNetwork
    /// <summary>
    /// Contains the profile name associated with the network.
    /// If the network doesn't have a profile, this member will be empty.
    /// If multiple profiles are associated with the network, there will be multiple entries with the same SSID in the visible network list. Profile names are case-sensitive.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
    public string profileName;
    /// <summary>
    /// Contains the SSID of the visible wireless network.
    /// </summary>
    public Dot11Ssid dot11Ssid;
    /// <summary>
    /// Specifies whether the network is an infrastructure or an ad-hoc one.
    /// </summary>
    public Dot11BssType dot11BssType;
    /// <summary>
    /// Indicates the number of BSSIDs in the network.
    /// </summary>
    public uint numberOfBssids;
    /// <summary>
    /// Indicates whether the network is connectable.
    /// </summary>
    public bool networkConnectable;
    /// <summary>
    /// Indicates why a network cannot be connected to. This member is only valid when <see cref="networkConnectable"/> is <c>false</c>.
    /// </summary>
    public WlanReasonCode wlanNotConnectableReason;
    /// <summary>
    /// The number of PHY types supported on available networks.
    /// The maximum value of this field is 8. If more than 8 PHY types are supported, <see cref="morePhyTypes"/> must be set to <c>true</c>.
    /// </summary>
    private uint numberOfPhyTypes;
    /// <summary>
    /// Contains an array of <see cref="Dot11PhyType"/> values that represent the PHY types supported by the available networks.
    /// When <see cref="numberOfPhyTypes"/> is greater than 8, this array contains only the first 8 PHY types.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
    private Dot11PhyType[] dot11PhyTypes;
    /// <summary>
    /// Gets the <see cref="Dot11PhyType"/> values that represent the PHY types supported by the available networks.
    /// </summary>
    public Dot11PhyType[] Dot11PhyTypes
    get
    Dot11PhyType[] ret = new Dot11PhyType[numberOfPhyTypes];
    Array.Copy(dot11PhyTypes, ret, numberOfPhyTypes);
    return ret;
    /// <summary>
    /// Specifies if there are more than 8 PHY types supported.
    /// When this member is set to <c>true</c>, an application must call <see cref="WlanClient.WlanInterface.GetNetworkBssList"/> to get the complete list of PHY types.
    /// <see cref="WlanBssEntry.phyId"/> contains the PHY type for an entry.
    /// </summary>
    public bool morePhyTypes;
    /// <summary>
    /// A percentage value that represents the signal quality of the network.
    /// This field contains a value between 0 and 100.
    /// A value of 0 implies an actual RSSI signal strength of -100 dbm.
    /// A value of 100 implies an actual RSSI signal strength of -50 dbm.
    /// You can calculate the RSSI signal strength value for values between 1 and 99 using linear interpolation.
    /// </summary>
    public uint wlanSignalQuality;
    /// <summary>
    /// Indicates whether security is enabled on the network.
    /// </summary>
    public bool securityEnabled;
    /// <summary>
    /// Indicates the default authentication algorithm used to join this network for the first time.
    /// </summary>
    public Dot11AuthAlgorithm dot11DefaultAuthAlgorithm;
    /// <summary>
    /// Indicates the default cipher algorithm to be used when joining this network.
    /// </summary>
    public Dot11CipherAlgorithm dot11DefaultCipherAlgorithm;
    /// <summary>
    /// Contains various flags specifying characteristics of the available network.
    /// </summary>
    public WlanAvailableNetworkFlags flags;
    /// <summary>
    /// Reserved for future use. Must be set to NULL.
    /// </summary>
    uint reserved;
    [DllImport("wlanapi.dll")]
    public static extern int WlanGetAvailableNetworkList(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] WlanGetAvailableNetworkFlags flags,
    [In, Out] IntPtr reservedPtr,
    [Out] out IntPtr availableNetworkListPtr);
    [Flags]
    public enum WlanProfileFlags
    /// <remarks>
    /// The only option available on Windows XP SP2.
    /// </remarks>
    AllUser = 0,
    GroupPolicy = 1,
    User = 2
    [DllImport("wlanapi.dll")]
    public static extern int WlanSetProfile(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] WlanProfileFlags flags,
    [In, MarshalAs(UnmanagedType.LPWStr)] string profileXml,
    [In, Optional, MarshalAs(UnmanagedType.LPWStr)] string allUserProfileSecurity,
    [In] bool overwrite,
    [In] IntPtr pReserved,
    [Out] out WlanReasonCode reasonCode);
    /// <summary>
    /// Defines the access mask of an all-user profile.
    /// </summary>
    [Flags]
    public enum WlanAccess
    /// <summary>
    /// The user can view profile permissions.
    /// </summary>
    ReadAccess = 0x00020000 | 0x0001,
    /// <summary>
    /// The user has read access, and the user can also connect to and disconnect from a network using the profile.
    /// </summary>
    ExecuteAccess = ReadAccess | 0x0020,
    /// <summary>
    /// The user has execute access and the user can also modify and delete permissions associated with a profile.
    /// </summary>
    WriteAccess = ReadAccess | ExecuteAccess | 0x0002 | 0x00010000 | 0x00040000
    /// <param name="flags">Not supported on Windows XP SP2: must be a <c>null</c> reference.</param>
    [DllImport("wlanapi.dll")]
    public static extern int WlanGetProfile(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In, MarshalAs(UnmanagedType.LPWStr)] string profileName,
    [In] IntPtr pReserved,
    [Out] out IntPtr profileXml,
    [Out, Optional] out WlanProfileFlags flags,
    [Out, Optional] out WlanAccess grantedAccess);
    [DllImport("wlanapi.dll")]
    public static extern int WlanGetProfileList(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] IntPtr pReserved,
    [Out] out IntPtr profileList
    [DllImport("wlanapi.dll")]
    public static extern void WlanFreeMemory(IntPtr pMemory);
    [DllImport("wlanapi.dll")]
    public static extern int WlanReasonCodeToString(
    [In] WlanReasonCode reasonCode,
    [In] int bufferSize,
    [In, Out] StringBuilder stringBuffer,
    IntPtr pReserved
    /// <summary>
    /// Defines the mask which specifies where a notification comes from.
    /// </summary>
    [Flags]
    public enum WlanNotificationSource
    None = 0,
    /// <summary>
    /// All notifications, including those generated by the 802.1X module.
    /// </summary>
    All = 0X0000FFFF,
    /// <summary>
    /// Notifications generated by the auto configuration module.
    /// </summary>
    ACM = 0X00000008,
    /// <summary>
    /// Notifications generated by MSM.
    /// </summary>
    MSM = 0X00000010,
    /// <summary>
    /// Notifications generated by the security module.
    /// </summary>
    Security = 0X00000020,
    /// <summary>
    /// Notifications generated by independent hardware vendors (IHV).
    /// </summary>
    IHV = 0X00000040
    /// <summary>
    /// Defines the types of ACM (<see cref="WlanNotificationSource.ACM"/>) notifications.
    /// </summary>
    /// <remarks>
    /// The enumeration identifiers correspond to the native <c>wlan_notification_acm_</c> identifiers.
    /// On Windows XP SP2, only the <c>ConnectionComplete</c> and <c>Disconnected</c> notifications are available.
    /// </remarks>
    public enum WlanNotificationCodeAcm
    AutoconfEnabled = 1,
    AutoconfDisabled,
    BackgroundScanEnabled,
    BackgroundScanDisabled,
    BssTypeChange,
    PowerSettingChange,
    ScanComplete,
    ScanFail,
    ConnectionStart,
    ConnectionComplete,
    ConnectionAttemptFail,
    FilterListChange,
    InterfaceArrival,
    InterfaceRemoval,
    ProfileChange,
    ProfileNameChange,
    ProfilesExhausted,
    NetworkNotAvailable,
    NetworkAvailable,
    Disconnecting,
    Disconnected,
    AdhocNetworkStateChange
    /// <summary>
    /// Defines the types of an MSM (<see cref="WlanNotificationSource.MSM"/>) notifications.
    /// </summary>
    /// <remarks>
    /// The enumeration identifiers correspond to the native <c>wlan_notification_msm_</c> identifiers.
    /// </remarks>
    public enum WlanNotificationCodeMsm
    Associating = 1,
    Associated,
    Authenticating,
    Connected,
    RoamingStart,
    RoamingEnd,
    RadioStateChange,
    SignalQualityChange,
    Disassociating,
    Disconnected,
    PeerJoin,
    PeerLeave,
    AdapterRemoval,
    AdapterOperationModeChange
    /// <summary>
    /// Contains information provided when registering for WLAN notifications.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>WLAN_NOTIFICATION_DATA</c> type.
    /// </remarks>
    [StructLayout(LayoutKind.Sequential)]
    public struct WlanNotificationData
    /// <summary>
    /// Specifies where the notification comes from.
    /// </summary>
    /// <remarks>
    /// On Windows XP SP2, this field must be set to <see cref="WlanNotificationSource.None"/>, <see cref="WlanNotificationSource.All"/> or <see cref="WlanNotificationSource.ACM"/>.
    /// </remarks>
    public WlanNotificationSource notificationSource;
    /// <summary>
    /// Indicates the type of notification. The value of this field indicates what type of associated data will be present in <see cref="dataPtr"/>.
    /// </summary>
    public int notificationCode;
    /// <summary>
    /// Indicates which interface the notification is for.
    /// </summary>
    public Guid interfaceGuid;
    /// <summary>
    /// Specifies the size of <see cref="dataPtr"/>, in bytes.
    /// </summary>
    public int dataSize;
    /// <summary>
    /// Pointer to additional data needed for the notification, as indicated by <see cref="notificationCode"/>.
    /// </summary>
    public IntPtr dataPtr;
    /// <summary>
    /// Gets the notification code (in the correct enumeration type) according to the notification source.
    /// </summary>
    public object NotificationCode
    get
    switch (notificationSource)
    case WlanNotificationSource.MSM:
    return (WlanNotificationCodeMsm)notificationCode;
    case WlanNotificationSource.ACM:
    return (WlanNotificationCodeAcm)notificationCode;
    default:
    return notificationCode;
    /// <summary>
    /// Defines the callback function which accepts WLAN notifications.
    /// </summary>
    public delegate void WlanNotificationCallbackDelegate(ref WlanNotificationData notificationData, IntPtr context);
    [DllImport("wlanapi.dll")]
    public static extern int WlanRegisterNotification(
    [In] IntPtr clientHandle,
    [In] WlanNotificationSource notifSource,
    [In] bool ignoreDuplicate,
    [In] WlanNotificationCallbackDelegate funcCallback,
    [In] IntPtr callbackContext,
    [In] IntPtr reserved,
    [Out] out WlanNotificationSource prevNotifSource);
    /// <summary>
    /// Defines flags which affect connecting to a WLAN network.
    /// </summary>
    [Flags]
    public enum WlanConnectionFlags
    /// <summary>
    /// Connect to the destination network even if the destination is a hidden network. A hidden network does not broadcast its SSID. Do not use this flag if the destination network is an ad-hoc network.
    /// <para>If the profile specified by <see cref="WlanConnectionParameters.profile"/> is not <c>null</c>, then this flag is ignored and the nonBroadcast profile element determines whether to connect to a hidden network.</para>
    /// </summary>
    HiddenNetwork = 0x00000001,
    /// <summary>
    /// Do not form an ad-hoc network. Only join an ad-hoc network if the network already exists. Do not use this flag if the destination network is an infrastructure network.
    /// </summary>
    AdhocJoinOnly = 0x00000002,
    /// <summary>
    /// Ignore the privacy bit when connecting to the network. Ignoring the privacy bit has the effect of ignoring whether packets are encryption and ignoring the method of encryption used. Only use this flag when connecting to an infrastructure network using a temporary profile.
    /// </summary>
    IgnorePrivacyBit = 0x00000004,
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    /// Exempt EAPOL traffic from encryption and decryption. This flag is used when an application must send EAPOL traffic over an infrastructure network that uses Open authentication and WEP encryption. This flag must not be used to connect to networks that require 802.1X authentication. This flag is only valid when <see cref="WlanConnectionParameters.wlanConnectionMode"/> is set to <see cref="WlanConnectionMode.TemporaryProfile"/>. Avoid using this flag whenever possible.
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    EapolPassthrough = 0x00000008
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    /// Specifies the parameters used when using the <see cref="WlanConnect"/> function.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>WLAN_CONNECTION_PARAMETERS</c> type.
    /// </remarks>
    [StructLayout(LayoutKind.Sequential)]
    public struct WlanConnectionParameters
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    /// Specifies the mode of connection.
    /// </summary>
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    /// Specifies the profile being used for the connection.
    /// The contents of the field depend on the <see cref="wlanConnectionMode"/>:
    /// <list type="table">
    /// <listheader>
    /// <term>Value of <see cref="wlanConnectionMode"/></term>
    /// <description>Contents of the profile string</description>
    /// </listheader>
    /// <item>
    /// <term><see cref="WlanConnectionMode.Profile"/></term>
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    /// </item>
    /// <item>
    /// <term><see cref="WlanConnectionMode.TemporaryProfile"/></term>
    /// <description>The XML representation of the profile used for the connection.</description>
    /// </item>
    /// <item>
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    /// <description><c>null</c></description>
    /// </item>
    /// </list>
    /// </summary>
    [MarshalAs(UnmanagedType.LPWStr)]
    public string profile;
    /// <summary>
    /// Pointer to a <see cref="Dot11Ssid"/> structure that specifies the SSID of the network to connect to.
    /// This field is optional. When set to <c>null</c>, all SSIDs in the profile will be tried.
    /// This field must not be <c>null</c> if <see cref="wlanConnectionMode"/> is set to <see cref="WlanConnectionMode.DiscoverySecure"/> or <see cref="WlanConnectionMode.DiscoveryUnsecure"/>.
    /// </summary>
    public IntPtr dot11SsidPtr;
    /// <summary>
    /// Pointer to a <c>Dot11BssidList</c> structure that contains the list of basic service set (BSS) identifiers desired for the connection.
    /// </summary>
    /// <remarks>
    /// On Windows XP SP2, must be set to <c>null</c>.
    /// </remarks>
    public IntPtr desiredBssidListPtr;
    /// <summary>
    /// A <see cref="Dot11BssType"/> value that indicates the BSS type of the network. If a profile is provided, this BSS type must be the same as the one in the profile.
    /// </summary>
    public Dot11BssType dot11BssType;
    /// <summary>
    /// Specifies ocnnection parameters.
    /// </summary>
    /// <remarks>
    /// On Windows XP SP2, must be set to 0.
    /// </remarks>
    public WlanConnectionFlags flags;
    /// <summary>
    /// The connection state of an ad hoc network.
    /// </summary>
    public enum WlanAdhocNetworkState
    /// <summary>
    /// The ad hoc network has been formed, but no client or host is connected to the network.
    /// </summary>
    Formed = 0,
    /// <summary>
    /// A client or host is connected to the ad hoc network.
    /// </summary>
    Connected = 1
    [DllImport("wlanapi.dll")]
    public static extern int WlanConnect(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] ref WlanConnectionParameters connectionParameters,
    IntPtr pReserved);
    [DllImport("wlanapi.dll")]
    public static extern int WlanDeleteProfile(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In, MarshalAs(UnmanagedType.LPWStr)] string profileName,
    IntPtr reservedPtr
    [DllImport("wlanapi.dll")]
    public static extern int WlanGetNetworkBssList(
    [In] IntPtr clientHandle,
    [In, MarshalAs(UnmanagedType.LPStruct)] Guid interfaceGuid,
    [In] IntPtr dot11SsidInt,
    [In] Dot11BssType dot11BssType,
    [In] bool securityEnabled,
    IntPtr reservedPtr,
    [Out] out IntPtr wlanBssList
    [StructLayout(LayoutKind.Sequential)]
    internal struct WlanBssListHeader
    internal uint totalSize;
    internal uint numberOfItems;
    /// <summary>
    /// Contains information about a basic service set (BSS).
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct WlanBssEntry
    /// <summary>
    /// Contains the SSID of the access point (AP) associated with the BSS.
    /// </summary>
    public Dot11Ssid dot11Ssid;
    /// <summary>
    /// The identifier of the PHY on which the AP is operating.
    /// </summary>
    public uint phyId;
    /// <summary>
    /// Contains the BSS identifier.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
    public byte[] dot11Bssid;
    /// <summary>
    /// Specifies whether the network is infrastructure or ad hoc.
    /// </summary>
    public Dot11BssType dot11BssType;
    public Dot11PhyType dot11BssPhyType;
    /// <summary>
    /// The received signal strength in dBm.
    /// </summary>
    public int rssi;
    /// <summary>
    /// The link quality reported by the driver. Ranges from 0-100.
    /// </summary>
    public uint linkQuality;
    /// <summary>
    /// If 802.11d is not implemented, the network interface card (NIC) must set this field to TRUE. If 802.11d is implemented (but not necessarily enabled), the NIC must set this field to TRUE if the BSS operation complies with the configured regulatory domain.
    /// </summary>
    public bool inRegDomain;
    /// <summary>
    /// Contains the beacon interval value from the beacon packet or probe response.
    /// </summary>
    public ushort beaconPeriod;
    /// <summary>
    /// The timestamp from the beacon packet or probe response.
    /// </summary>
    public ulong timestamp;
    /// <summary>
    /// The host timestamp value when the beacon or probe response is received.
    /// </summary>
    public ulong hostTimestamp;
    /// <summary>
    /// The capability value from the beacon packet or probe response.
    /// </summary>
    public ushort capabilityInformation;
    /// <summary>
    /// The frequency of the center channel, in kHz.
    /// </summary>
    public uint chCenterFrequency;
    /// <summary>
    /// Contains the set of data transfer rates supported by the BSS.
    /// </summary>
    public WlanRateSet wlanRateSet;
    /// <summary>
    /// The offset of the information element (IE) data blob.
    /// </summary>
    public uint ieOffset;
    /// <summary>
    /// The size of the IE data blob, in bytes.
    /// </summary>
    public uint ieSize;
    /// <summary>
    /// Contains the set of supported data rates.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    public struct WlanRateSet
    /// <summary>
    /// The length, in bytes, of <see cref="rateSet"/>.
    /// </summary>
    private uint rateSetLength;
    /// <summary>
    /// An array of supported data transfer rates.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 126)]
    private ushort[] rateSet;
    /// <summary>
    /// Gets an array of supported data transfer rates.
    /// If the rate is a basic rate, the first bit of the rate value is set to 1.
    /// A basic rate is the data transfer rate that all stations in a basic service set (BSS) can use to receive frames from the wireless medium.
    /// </summary>
    public ushort[] Rates
    get
    ushort[] rates = new ushort[rateSetLength / sizeof(ushort)];
    Array.Copy(rateSet, rates, rates.Length);
    return rates;
    /// <summary>
    /// Calculates the data transfer rate in mbit/s for a supported rate.
    /// </summary>
    /// <param name="rateIndex">The WLAN rate index (0-based).</param>
    /// <returns>The data transfer rate in mbit/s.</returns>
    /// <exception cref="ArgumentOutOfRangeException">Thrown if <param name="rateIndex"/> does not specify an existing rate.</exception>
    public double GetRateInMbps(int rateIndex)
    if ((rateIndex < 0) || (rateIndex > rateSet.Length))
    throw new ArgumentOutOfRangeException("rateIndex");
    return (rateSet[rateIndex] & 0x7FFF) * 0.5;
    /// <summary>
    /// Represents an error occuring during WLAN operations which indicate their failure via a <see cref="WlanReasonCode"/>.
    /// </summary>
    public class WlanException : Exception
    private readonly WlanReasonCode reasonCode;
    public WlanException(WlanReasonCode reasonCode)
    this.reasonCode = reasonCode;
    /// <summary>
    /// Gets the WLAN reason code.
    /// </summary>
    /// <value>The WLAN reason code.</value>
    public WlanReasonCode ReasonCode
    get { return reasonCode; }
    /// <summary>
    /// Gets a message that describes the reason code.
    /// </summary>
    /// <value></value>
    /// <returns>The error message that explains the reason for the exception, or an empty string("").</returns>
    public override string Message
    get
    StringBuilder sb = new StringBuilder(1024);
    return
    WlanReasonCodeToString(reasonCode, sb.Capacity, sb, IntPtr.Zero) == 0 ?
    sb.ToString() :
    string.Empty;
    // TODO: .NET-ify the WlanReasonCode enum (naming convention + docs).
    /// <summary>
    /// Defines reasons for a failure of a WLAN operation.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native reason code identifiers (<c>WLAN_REASON_CODE_xxx</c> identifiers).
    /// </remarks>
    public enum WlanReasonCode
    Success = 0,
    // general codes
    UNKNOWN = 0x10000 + 1,
    RANGE_SIZE = 0x10000,
    BASE = 0x10000 + RANGE_SIZE,
    // range for Auto Config
    AC_BASE = 0x10000 + RANGE_SIZE,
    AC_CONNECT_BASE = (AC_BASE + RANGE_SIZE / 2),
    AC_END = (AC_BASE + RANGE_SIZE - 1),
    // range for profile manager
    // it has profile adding failure reason codes, but may not have
    // connection reason codes
    PROFILE_BASE = 0x10000 + (7 * RANGE_SIZE),
    PROFILE_CONNECT_BASE = (PROFILE_BASE + RANGE_SIZE / 2),
    PROFILE_END = (PROFILE_BASE + RANGE_SIZE - 1),
    // range for MSM
    MSM_BASE = 0x10000 + (2 * RANGE_SIZE),
    MSM_CONNECT_BASE = (MSM_BASE + RANGE_SIZE / 2),
    MSM_END = (MSM_BASE + RANGE_SIZE - 1),
    // range for MSMSEC
    MSMSEC_BASE = 0x10000 + (3 * RANGE_SIZE),
    MSMSEC_CONNECT_BASE = (MSMSEC_BASE + RANGE_SIZE / 2),
    MSMSEC_END = (MSMSEC_BASE + RANGE_SIZE - 1),
    // AC network incompatible reason codes
    NETWORK_NOT_COMPATIBLE = (AC_BASE + 1),
    PROFILE_NOT_COMPATIBLE = (AC_BASE + 2),
    // AC connect reason code
    NO_AUTO_CONNECTION = (AC_CONNECT_BASE + 1),
    NOT_VISIBLE = (AC_CONNECT_BASE + 2),
    GP_DENIED = (AC_CONNECT_BASE + 3),
    USER_DENIED = (AC_CONNECT_BASE + 4),
    BSS_TYPE_NOT_ALLOWED = (AC_CONNECT_BASE + 5),
    IN_FAILED_LIST = (AC_CONNECT_BASE + 6),
    IN_BLOCKED_LIST = (AC_CONNECT_BASE + 7),
    SSID_LIST_TOO_LONG = (AC_CONNECT_BASE + 8),
    CONNECT_CALL_FAIL = (AC_CONNECT_BASE + 9),
    SCAN_CALL_FAIL = (AC_CONNECT_BASE + 10),
    NETWORK_NOT_AVAILABLE = (AC_CONNECT_BASE + 11),
    PROFILE_CHANGED_OR_DELETED = (AC_CONNECT_BASE + 12),
    KEY_MISMATCH = (AC_CONNECT_BASE + 13),
    USER_NOT_RESPOND = (AC_CONNECT_BASE + 14),
    // Profile validation errors
    INVALID_PROFILE_SCHEMA = (PROFILE_BASE + 1),
    PROFILE_MISSING = (PROFILE_BASE + 2),
    INVALID_PROFILE_NAME = (PROFILE_BASE + 3),
    INVALID_PROFILE_TYPE = (PROFILE_BASE + 4),
    INVALID_PHY_TYPE = (PROFILE_BASE + 5),
    MSM_SECURITY_MISSING = (PROFILE_BASE + 6),
    IHV_SECURITY_NOT_SUPPORTED = (PROFILE_BASE + 7),
    IHV_OUI_MISMATCH = (PROFILE_BASE + 8),
    // IHV OUI not present but there is IHV settings in profile
    IHV_OUI_MISSING = (PROFILE_BASE + 9),
    // IHV OUI is present but there is no IHV settings in profile
    IHV_SETTINGS_MISSING = (PROFILE_BASE + 10),
    // both/conflict MSMSec and IHV security settings exist in profile
    CONFLICT_SECURITY = (PROFILE_BASE + 11),
    // no IHV or MSMSec security settings in profile
    SECURITY_MISSING = (PROFILE_BASE + 12),
    INVALID_BSS_TYPE = (PROFILE_BASE + 13),
    INVALID_ADHOC_CONNECTION_MODE = (PROFILE_BASE + 14),
    NON_BROADCAST_SET_FOR_ADHOC = (PROFILE_BASE + 15),
    AUTO_SWITCH_SET_FOR_ADHOC = (PROFILE_BASE + 16),
    AUTO_SWITCH_SET_FOR_MANUAL_CONNECTION = (PROFILE_BASE + 17),
    IHV_SECURITY_ONEX_MISSING = (PROFILE_BASE + 18),
    PROFILE_SSID_INVALID = (PROFILE_BASE + 19),
    TOO_MANY_SSID = (PROFILE_BASE + 20),
    // MSM network incompatible reasons
    UNSUPPORTED_SECURITY_SET_BY_OS = (MSM_BASE + 1),
    UNSUPPORTED_SECURITY_SET = (MSM_BASE + 2),
    BSS_TYPE_UNMATCH = (MSM_BASE + 3),
    PHY_TYPE_UNMATCH = (MSM_BASE + 4),
    DATARATE_UNMATCH = (MSM_BASE + 5),
    // MSM connection failure reasons, to be defined
    // failure reason codes
    // user called to disconnect
    USER_CANCELLED = (MSM_CONNECT_BASE + 1),
    // got disconnect while associating
    ASSOCIATION_FAILURE = (MSM_CONNECT_BASE + 2),
    // timeout for association
    ASSOCIATION_TIMEOUT = (MSM_CONNECT_BASE + 3),
    // pre-association security completed with failure
    PRE_SECURITY_FAILURE = (MSM_CONNECT_BASE + 4),
    // fail to start post-association security
    START_SECURITY_FAILURE = (MSM_CONNECT_BASE + 5),
    // post-association security completed with failure
    SECURITY_FAILURE = (MSM_CONNECT_BASE + 6),
    // security watchdog timeout
    SECURITY_TIMEOUT = (MSM_CONNECT_BASE + 7),
    // got disconnect from driver when roaming
    ROAMING_FAILURE = (MSM_CONNECT_BASE + 8),
    // failed to start security for roaming
    ROAMING_SECURITY_FAILURE = (MSM_CONNECT_BASE + 9),
    // failed to start security for adhoc-join
    ADHOC_SECURITY_FAILURE = (MSM_CONNECT_BASE + 10),
    // got disconnection from driver
    DRIVER_DISCONNECTED = (MSM_CONNECT_BASE + 11),
    // driver operation failed
    DRIVER_OPERATION_FAILURE = (MSM_CONNECT_BASE + 12),
    // Ihv service is not available
    IHV_NOT_AVAILABLE = (MSM_CONNECT_BASE + 13),
    // Response from ihv timed out
    IHV_NOT_RESPONDING = (MSM_CONNECT_BASE + 14),
    // Timed out waiting for driver to disconnect
    DISCONNECT_TIMEOUT = (MSM_CONNECT_BASE + 15),
    // An internal error prevented the operation from being completed.
    INTERNAL_FAILURE = (MSM_CONNECT_BASE + 16),
    // UI Request timed out.
    UI_REQUEST_TIMEOUT = (MSM_CONNECT_BASE + 17),
    // Roaming too often, post security is not completed after 5 times.
    TOO_MANY_SECURITY_ATTEMPTS = (MSM_CONNECT_BASE + 18),
    // MSMSEC reason codes
    MSMSEC_MIN = MSMSEC_BASE,
    // Key index specified is not valid
    MSMSEC_PROFILE_INVALID_KEY_INDEX = (MSMSEC_BASE + 1),
    // Key required, PSK present
    MSMSEC_PROFILE_PSK_PRESENT = (MSMSEC_BASE + 2),
    // Invalid key length
    MSMSEC_PROFILE_KEY_LENGTH = (MSMSEC_BASE + 3),
    // Invalid PSK length
    MSMSEC_PROFILE_PSK_LENGTH = (MSMSEC_BASE + 4),
    // No auth/cipher specified
    MSMSEC_PROFILE_NO_AUTH_CIPHER_SPECIFIED = (MSMSEC_BASE + 5),
    // Too many auth/cipher specified
    MSMSEC_PROFILE_TOO_MANY_AUTH_CIPHER_SPECIFIED = (MSMSEC_BASE + 6),
    // Profile contains duplicate auth/cipher
    MSMSEC_PROFILE_DUPLICATE_AUTH_CIPHER = (MSMSEC_BASE + 7),
    // Profile raw data is invalid (1x or key data)
    MSMSEC_PROFILE_RAWDATA_INVALID = (MSMSEC_BASE + 8),
    // Invalid auth/cipher combination
    MSMSEC_PROFILE_INVALID_AUTH_CIPHER = (MSMSEC_BASE + 9),
    // 802.1x disabled when it's required to be enabled
    MSMSEC_PROFILE_ONEX_DISABLED = (MSMSEC_BASE + 10),
    // 802.1x enabled when it's required to be disabled
    MSMSEC_PROFILE_ONEX_ENABLED = (MSMSEC_BASE + 11),
    MSMSEC_PROFILE_INVALID_PMKCACHE_MODE = (MSMSEC_BASE + 12),
    MSMSEC_PROFILE_INVALID_PMKCACHE_SIZE = (MSMSEC_BASE + 13),
    MSMSEC_PROFILE_INVALID_PMKCACHE_TTL = (MSMSEC_BASE + 14),
    MSMSEC_PROFILE_INVALID_PREAUTH_MODE = (MSMSEC_BASE + 15),
    MSMSEC_PROFILE_INVALID_PREAUTH_THROTTLE = (MSMSEC_BASE + 16),
    // PreAuth enabled when PMK cache is disabled
    MSMSEC_PROFILE_PREAUTH_ONLY_ENABLED = (MSMSEC_BASE + 17),
    // Capability matching failed at network
    MSMSEC_CAPABILITY_NETWORK = (MSMSEC_BASE + 18),
    // Capability matching failed at NIC
    MSMSEC_CAPABILITY_NIC = (MSMSEC_BASE + 19),
    // Capability matching failed at profile
    MSMSEC_CAPABILITY_PROFILE = (MSMSEC_BASE + 20),
    // Network does not support specified discovery type
    MSMSEC_CAPABILITY_DISCOVERY = (MSMSEC_BASE + 21),
    // Passphrase contains invalid character
    MSMSEC_PROFILE_PASSPHRASE_CHAR = (MSMSEC_BASE + 22),
    // Key material contains invalid character
    MSMSEC_PROFILE_KEYMATERIAL_CHAR = (MSMSEC_BASE + 23),
    // Wrong key type specified for the auth/cipher pair
    MSMSEC_PROFILE_WRONG_KEYTYPE = (MSMSEC_BASE + 24),
    // "Mixed cell" suspected (AP not beaconing privacy, we have privacy enabled profile)
    MSMSEC_MIXED_CELL = (MSMSEC_BASE + 25),
    // Auth timers or number of timeouts in profile is incorrect
    MSMSEC_PROFILE_AUTH_TIMERS_INVALID = (MSMSEC_BASE + 26),
    // Group key update interval in profile is incorrect
    MSMSEC_PROFILE_INVALID_GKEY_INTV = (MSMSEC_BASE + 27),
    // "Transition network" suspected, trying legacy 802.11 security
    MSMSEC_TRANSITION_NETWORK = (MSMSEC_BASE + 28),
    // Key contains characters which do not map to ASCII
    MSMSEC_PROFILE_KEY_UNMAPPED_CHAR = (MSMSEC_BASE + 29),
    // Capability matching failed at profile (auth not found)
    MSMSEC_CAPABILITY_PROFILE_AUTH = (MSMSEC_BASE + 30),
    // Capability matching failed at profile (cipher not found)
    MSMSEC_CAPABILITY_PROFILE_CIPHER = (MSMSEC_BASE + 31),
    // Failed to queue UI request
    MSMSEC_UI_REQUEST_FAILURE = (MSMSEC_CONNECT_BASE + 1),
    // 802.1x authentication did not start within configured time
    MSMSEC_AUTH_START_TIMEOUT = (MSMSEC_CONNECT_BASE + 2),
    // 802.1x authentication did not complete within configured time
    MSMSEC_AUTH_SUCCESS_TIMEOUT = (MSMSEC_CONNECT_BASE + 3),
    // Dynamic key exchange did not start within configured time
    MSMSEC_KEY_START_TIMEOUT = (MSMSEC_CONNECT_BASE + 4),
    // Dynamic key exchange did not succeed within configured time
    MSMSEC_KEY_SUCCESS_TIMEOUT = (MSMSEC_CONNECT_BASE + 5),
    // Message 3 of 4 way handshake has no key data (RSN/WPA)
    MSMSEC_M3_MISSING_KEY_DATA = (MSMSEC_CONNECT_BASE + 6),
    // Message 3 of 4 way handshake has no IE (RSN/WPA)
    MSMSEC_M3_MISSING_IE = (MSMSEC_CONNECT_BASE + 7),
    // Message 3 of 4 way handshake has no Group Key (RSN)
    MSMSEC_M3_MISSING_GRP_KEY = (MSMSEC_CONNECT_BASE + 8),
    // Matching security capabilities of IE in M3 failed (RSN/WPA)
    MSMSEC_PR_IE_MATCHING = (MSMSEC_CONNECT_BASE + 9),
    // Matching security capabilities of Secondary IE in M3 failed (RSN)
    MSMSEC_SEC_IE_MATCHING = (MSMSEC_CONNECT_BASE + 10),
    // Required a pairwise key but AP configured only group keys
    MSMSEC_NO_PAIRWISE_KEY = (MSMSEC_CONNECT_BASE + 11),
    // Message 1 of group key handshake has no key data (RSN/WPA)
    MSMSEC_G1_MISSING_KEY_DATA = (MSMSEC_CONNECT_BASE + 12),
    // Message 1 of group key handshake has no group key
    MSMSEC_G1_MISSING_GRP_KEY = (MSMSEC_CONNECT_BASE + 13),
    // AP reset secure bit after connection was secured
    MSMSEC_PEER_INDICATED_INSECURE = (MSMSEC_CONNECT_BASE + 14),
    // 802.1x indicated there is no authenticator but profile requires 802.1x
    MSMSEC_NO_AUTHENTICATOR = (MSMSEC_CONNECT_BASE + 15),
    // Plumbing settings to NIC failed
    MSMSEC_NIC_FAILURE = (MSMSEC_CONNECT_BASE + 16),
    // Operation was cancelled by caller
    MSMSEC_CANCELLED = (MSMSEC_CONNECT_BASE + 17),
    // Key was in incorrect format
    MSMSEC_KEY_FORMAT = (MSMSEC_CONNECT_BASE + 18),
    // Security downgrade detected
    MSMSEC_DOWNGRADE_DETECTED = (MSMSEC_CONNECT_BASE + 19),
    // PSK mismatch suspected
    MSMSEC_PSK_MISMATCH_SUSPECTED = (MSMSEC_CONNECT_BASE + 20),
    // Forced failure because connection method was not secure
    MSMSEC_FORCED_FAILURE = (MSMSEC_CONNECT_BASE + 21),
    // ui request couldn't be queued or user pressed cancel
    MSMSEC_SECURITY_UI_FAILURE = (MSMSEC_CONNECT_BASE + 22),
    MSMSEC_MAX = MSMSEC_END
    /// <summary>
    /// Contains information about connection related notifications.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>WLAN_CONNECTION_NOTIFICATION_DATA</c> type.
    /// </remarks>
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct WlanConnectionNotificationData
    /// <remarks>
    /// On Windows XP SP 2, only <see cref="WlanConnectionMode.Profile"/> is supported.
    /// </remarks>
    public WlanConnectionMode wlanConnectionMode;
    /// <summary>
    /// The name of the profile used for the connection. Profile names are case-sensitive.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
    public string profileName;
    /// <summary>
    /// The SSID of the association.
    /// </summary>
    public Dot11Ssid dot11Ssid;
    /// <summary>
    /// The BSS network type.
    /// </summary>
    public Dot11BssType dot11BssType;
    /// <summary>
    /// Indicates whether security is enabled for this connection.
    /// </summary>
    public bool securityEnabled;
    /// <summary>
    /// Indicates the reason for an operation failure.
    /// This field has a value of <see cref="WlanReasonCode.Success"/> for all connection-related notifications except <see cref="WlanNotificationCodeAcm.ConnectionComplete"/>.
    /// If the connection fails, this field indicates the reason for the failure.
    /// </summary>
    public WlanReasonCode wlanReasonCode;
    /// <summary>
    /// This field contains the XML presentation of the profile used for discovery, if the connection succeeds.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 1)]
    public string profileXml;
    /// <summary>
    /// Indicates the state of an interface.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>WLAN_INTERFACE_STATE</c> type.
    /// </remarks>
    public enum WlanInterfaceState
    /// <summary>
    /// The interface is not ready to operate.
    /// </summary>
    NotReady = 0,
    /// <summary>
    /// The interface is connected to a network.
    /// </summary>
    Connected = 1,
    /// <summary>
    /// The interface is the first node in an ad hoc network. No peer has connected.
    /// </summary>
    AdHocNetworkFormed = 2,
    /// <summary>
    /// The interface is disconnecting from the current network.
    /// </summary>
    Disconnecting = 3,
    /// <summary>
    /// The interface is not connected to any network.
    /// </summary>
    Disconnected = 4,
    /// <summary>
    /// The interface is attempting to associate with a network.
    /// </summary>
    Associating = 5,
    /// <summary>
    /// Auto configuration is discovering the settings for the network.
    /// </summary>
    Discovering = 6,
    /// <summary>
    /// The interface is in the process of authenticating.
    /// </summary>
    Authenticating = 7
    /// <summary>
    /// Contains the SSID of an interface.
    /// </summary>
    public struct Dot11Ssid
    /// <summary>
    /// The length, in bytes, of the <see cref="SSID"/> array.
    /// </summary>
    public uint SSIDLength;
    /// <summary>
    /// The SSID.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
    public byte[] SSID;
    /// <summary>
    /// Defines an 802.11 PHY and media type.
    /// </summary>
    /// <remarks>
    /// Corresponds to the native <c>DOT11_PHY_TYPE</c> type.
    /// </remarks>
    public enum Dot11PhyType : uint
    /// <summary>
    /// Specifies an unknown or uninitialized PHY type.
    /// </summary>
    Unknown = 0,
    /// <summary>
    /// Specifies any PHY type.
    /// </summary>
    Any = Unknown,
    /// <summary>
    /// Specifies a frequency-hopping spread-spectrum (FHSS) PHY. Bluetooth devices can use FHSS or an adaptation of FHSS.
    /// </summary>
    FHSS = 1,
    /// <summary>
    /// Specifies a direct sequence spread spectrum (DSSS) PHY.
    /// </summary>
    DSSS = 2,
    /// <summary>
    /// Specifies an infrared (IR) baseband PHY.
    /// </summary>
    IrBaseband = 3,
    /// <summary>
    /// Specifies an orthogonal frequency division multiplexing (OFDM) PHY. 802.11a devices can use OFDM.
    /// </summary>
    OFDM = 4,
    /// <summary>
    /// Specifies a high-rate DSSS (HRDSSS) PHY.
    /// </summary>
    HRDSSS = 5,
    /// <summary>
    /// Specifies an extended rate PHY (ERP). 802.11g devices can use ERP.
    /// </summary>
    ERP = 6,
    /// <summary>
    /// Specifies the start of the range that is used to define PHY types that are developed by an independent hardware vendor (IHV).
    /// </summary>
    IHV_Start = 0x80000000,
    /// <summary>
    /// Specifies the end of the range that is used to define PHY types that are developed by an independent hardware vendor (IHV).
    /// </summary>
    IHV_End = 0xffffffff

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  • Can moving large sharepoint lists to database and using database table as an external list help performance?

    Hi All,
    I have to maintain a huge SharePoint 2010 list with more than 700,000 items in it. The items are data records(not documents) and are distributed among a number of folders. There are also a number webparts that are currently using this list. As you can imagine
    the performance of queries on the list have degraded considerably. Even opening the folders with too many items in them takes quite some time. We are looking for a solution for this situation and some people suggested to move the list items to a SQL Server
    table and make an external list representing the original list. They think this way the changes that we have to make in the webparts source codes will be minimal.
    I am not sure if this is the best solution as I have heard about slow external lists. Do you think using the external list instead of our current list improves the performance? Do you think this is the right solution for us?
    I would be grateful if you tell me your ideas to solve this problem.
    Thanks in advance

    "right solution for us" is hard to solve without more info.
    SharePoint list items can include things like version history, content approval, audit tracking, and more... such things are NOT built into SQL.
    BCS is an option, and generally changing a list CAN have a very minimal impact (making many assumptions about how it's used)...
    BCS also incurs an overhead of the lookup (since it's external). And there are record limits (defaults at a minimum).
    And more importantly, SharePoint *can* handle large lists... if done appropriately... but can also be mis-handled.
    The limits imposed on large lists by SharePoint, are largely attributable DIRECTLY BACK TO SQL (specifically, the number of records that can be obtained with ROW locks before switching to PAGE locks or TABLE locks, which have LARGER impacts).
    So again, BCS is an option, but whether it's the "right solution for us" is more dependent. Plus, you would probably also benefit by spending some time investigating the other uses (web parts/etc) for opportunities to improve their performance,
    user experience, etc.
    Scott Brickey
    MCTS, MCPD, MCITP
    www.sbrickey.com
    Strategic Data Systems - for all your SharePoint needs

  • How can we see previleges assigned to all users using database query

    I am using the follwoing query to see previleges assigned to all users , but the suprising thing is that it shows GP_APP_ID as null for a large number of user , even though in discoverer administrator I can see the previleges assigned to those users. I do not understand why it does that. Can someone please help so that I can see the previleges of all users
    select unique EU_USERNAME, decode (GP_APP_ID ,1000, 'Desktop / Plus Privilege (U)',
    1001, 'Create / Edit Query (U)',
    1002, 'Item Drill (U)',
    1003, 'Drill Out (U)',
    1004, 'Grant Workbook (aka Sharing) (U)',
    1005, 'Collect Query Statistics (U)',
    1006 ,'Admin Privilege (A)',
    1007, 'Set Privilege (A)',
    1008, 'Create / Edit Business Area (A)',
    1009, 'Format Business Area (A)',
    1010, 'Create / Edit Summaries (A)',
    1011, 'Not used as far as can be determined',
    1012, 'Schedule (U)',
    1013, 'User is never required to schedule workbooks (U)',
    1014, 'Save workbooks to database (U)',
    1015, 'Managed scheduled workbooks (A)',
    1016, 'to 1017 Not used as far as can be determined',
    1018, 'Change Password',
    1019, 'to 1023 Not used as far as can be determined',
    1024, 'Create Link (U))') from
    EUL5_ACCESS_PRIVS A,
    EUL5_EUL_USERS U
    where A.AP_EU_ID=U.EU_ID
    order by EU_USERNAME
    thanks

    Hi,
    This is probably because the business area security is stored in the same table. So you will probably find that where GP_APP_ID is null then GBA_BA_ID holds the value of the business area. You should change your query to just select where GP_APP_ID IS NOT NULL.
    Rod West

  • "List does not exist" error in a sub-site (ListViewWebPart )

    Hi all,
    I have a site collection, with several lists/libraries in the root site. I wanted to display the list in sub-sites, using the List View Tool / Save webpart (in SharePoint designer) to save the
    XsltListViewWebPart to the site gallery and adding it to publishing pages in my sub-site. Sometimes it works fine, but sometime I get the error: "List does not exist. The page you selected contains a list that does not exist. It may have been deleted
    by another user."
    When I refresh the page (F5), the error disappears and the page displays well. It seems that only contributors to the list/library have the issue.
    Any workaround?
    Thanks in advance.

     
    Hello,
    The error occurs only for users who have "Contribute" access to the lists. Sometimes everything is working well and sometimes the error occurs (not always) and a simple refresh of the page make
    it disappear. There is no specific permissions on lists items: contributors have rights on the whole list.
    Another point: this error occurs only on “Publishing pages”, not on “site pages”. I assume then that it is linked with the publishing feature.
    Hope this clarifies?
    Regards,
    Cpo

  • Exposing sub site list on parent site (SPO 2010)

    2 site collections configured the same, one is a team site one a public site. In the team site I can expose lists from a sub site on a parent site page via a custom data view web part. The exact same technique doesn't work on the public site and throws the
    "list doesn't exist" error. The web part is configured correctly because it works if I insert it on a sub site page. It's not a permissions issue - the source list can be accessed anonymously on the sub site.
    Any ideas? 
     

    I was able to get the sub site list web part to show up on a parent site page - but then when I went to add the exact same web part to a different  zone on the same page: BAM! List not found.
    It also started randomly adding chunks of content from list items right in the web part code.....
    I tried but can't find any justification for any of this behavior, so as usual when I work with Sharepoint I find myself agreeing with the people who say it's a mind numbingly badly made product.

  • Change default language for SharePoint Online Sub-Site

    Hi Guys,
    Am trying to create multiple sub-sites using a custom site template in SharePoint Online. The default language of the Site Template is English. But I want to create sites for difference languages.
    There is a option to setup multiple languages on the site and change the browser preferences. But we want that anyone irrespective of the language, should see the site in the language it has been configured for, For instance France site should display data
    in French irrespective of any user see it.
    To accomplish this, I was trying to find if there is a way to change the default language of the site after we create it.
    Can some one give me an idea if we can achieve this behavior or if there an alternate to do it ?
    Thanks,
    Nutan
    Nutan Sharma

    Hi,
    According to your post, my understanding is that you want to change the default site language.
    There is no supported way to change the default language of a site collection, once it has been created.
    There is a way to change it by modifying the content database using SQL Management Studio(though it is not supported), you can refer to the article below to change the default language in an existed site.
    http://sharepointchick.com/archive/2008/04/29/changing-the-language-of-an-existing-sharepoint-site.aspx
    Thanks,
    Jason
    Forum Support
    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
    [email protected]
    Jason Guo
    TechNet Community Support

  • Can I save a list in Reminders?

    Can I save a list in Reminders to use again, e.g. a packing check list?

    Sorry, thanks for the reply but that's not what I asked.
    I understand how to make a list and add items to it, however when an item has been done / acheived and is ticked it disappears.
    I was wondering if there was a way to save the entiire list for reuse in the future. To be precise, when I travel I want to write a check list of photographic equipment and to check them off as I pack. I do not wish to rewrite this list every time I travel, which is often, so is there a way to save it?
    Thanks

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