Multiple writes possible in DS in labview but not in CVI?

Hi
Am using Datasocket to communicate between to VI's, In one of the VI's am opening a new dataitem in "readwrite" mode and doing both read and write operation, and in the other VI am just writing on the dataitem by supplying the URL to the write function, surprisingly this is possible even though i havent created the dataitem from DS manager and have not selected the option of "allow multiple writes".
But if am creating a CVI application, which opens the dataitem in "readwrite" mode, and if i write on that dataitem from labview, it gives me an error, i even tried selecting the "allow multiple write" on this dataitem.
Please suggest some solution. Also if i open a lot of Dataitems will it cause any problems?, i guess our project needs atleast 100 dataitems if i will have to use command and response in different dataitems.
thanx for the help
Arun

Hello,
The following Knowledge Base describes two possible soltions for this issue.
Why Does My DataSocket Connection in LabVIEW Fail with "Error: Can't connect to data item, another w...
The second solution is what you have already described with checking the box to Allow Multiple Writers. I am not sure why that is not working in your case, but I would suggest trying the first soltuion suggested in the KB. It involves creating the datasocket item a certain way in LabVIEW, and more details are available in the KB.
Scott Y
NI

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Message Edited by TheSleeve on 05-22-2006 12:12 PM
Attachments:
SingleChannelTHD.vi ‏159 KB
Test Sequence2.seq ‏15 KB

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Pathetic Apple TV - no home sharing possible? Can connect mac but not ipad or iphone?

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Thoric wrote:
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Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up a guest account” (without the quotes) in the search box.
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Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
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In FormView Pager Template shown in design page but not shown in runtime.....

//////////////////////MY TABLE//////////////////
USE [logistics_tab]
GO
/****** Object: Table [dbo].[dtype] Script Date: 02/07/2015 10:19:00 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[dtype](
[dtid] [int] IDENTITY(1,1) NOT NULL,
[dtcd] [char](5) NOT NULL,
[desp] [char](15) NOT NULL,
CONSTRAINT [PK_dtype] PRIMARY KEY CLUSTERED
[dtid] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [Uq_dtcd_Dtype] UNIQUE NONCLUSTERED
[dtcd] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
////////////MY STORED PROCEDURE/////////////////////
USE [logistics_tab]
GO
/****** Object: StoredProcedure [dbo].[dtype_pro] Script Date: 02/07/2015 10:21:42 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[dtype_pro]
@dtid as int=0,
@dtcd as char(5)='',
@desp as char(15)='',
@status as varchar(50)=''
AS
BEGIN
SET NOCOUNT ON;
if(@status = 'Display')
begin
Select * from dtype
end
else if(@status = 'Add')
begin
Insert into dtype(dtcd,desp) values (@dtcd,@desp)
end
else if(@status = 'Update')
begin
Update dtype set dtcd=@dtcd, desp=@desp where dtid=@dtid
end
else if(@status = 'Delete')
begin
Delete from dtype where dtid=@dtid
end
END
GO
//////////MY DESIGN PAGE/////////////
<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="DestnType.aspx.cs" Inherits="LogisticsApp.DestnType" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:FormView ID="FormView1" runat="server" DataKeyNames= "dtid" GridLines="Both"
AllowPaging="True" PagerStyle-BorderStyle="NotSet" PagerStyle-ForeColor="Black">
<FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
<PagerStyle BackColor="#B5C7DE" ForeColor="Black" HorizontalAlign="Center" Font-Bold="true" Font-Size="Large"/>
<ItemTemplate>
<table>
<tr><td align="right"><b>Employee ID:</b></td><td><%# Eval("dtid") %></td></tr>
<tr>
<td colspan="2">
<asp:LinkButton ID="EditButton"
Text="Edit"
CommandName="Edit"
RunAt="server"/>
 
<asp:LinkButton ID="NewButton"
Text="New"
CommandName="New"
RunAt="server"/>
 
<asp:LinkButton ID="DeleteButton"
Text="Delete"
CommandName="Delete"
RunAt="server"/>
</td>
</tr>
</table>
</ItemTemplate>
<PagerTemplate>
<table>
<tr>
<td><asp:Button ID="FirstButton1" CommandName="Page" CommandArgument="First"
Text="<1<" RunAt="server" Font-Bold="True" /> </td>
</tr>
</table>
</PagerTemplate>
</asp:FormView>
</asp:Content>
///////MY CODE///////////
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Text.RegularExpressions;
namespace LogisticsApp
public partial class DestnType : System.Web.UI.Page
public LogisticsApp.MyConnection.OfcConn constr = new MyConnection.OfcConn();
SqlConnection con;
SqlCommand com;
SqlDataAdapter sqlda;
DataSet ds;
DataTable dt;//for form view
protected void Page_Load(object sender, EventArgs e)
if (!IsPostBack)
BindGrid();
protected void BindGrid()
try
con = new SqlConnection(constr.str);
dt = new DataTable();//for form view
com = new SqlCommand();
con.Open();
com.Connection = con;
com.CommandText = "dtype_pro";
com.CommandType = CommandType.StoredProcedure;
com.Parameters.Add(new SqlParameter("@status", SqlDbType.VarChar, 50));
com.Parameters["@status"].Value = "Display";
sqlda = new SqlDataAdapter(com);
ds = new DataSet();
sqlda.Fill(dt);//for formview
sqlda.Fill(ds);
if (ds.Tables[0].Rows.Count > 0) //Check if DataTable returns data
FormView1.DataSource = dt;
DataBind();
catch (Exception ex)
//lblerr.Text = ex.Message;
throw ex;
finally
if (con != null)
if (con.State == ConnectionState.Open)
con.Close();
con = null;
protected void DtypeFormView_PageIndexChanging(object sender, FormViewPageEventArgs e)
FormView1.PageIndex = e.NewPageIndex;
BindGrid();
//plz plz... help as soon as possible this is simple code but not show at run time....... :(


Good day uzma
abidi
It has been long time since I used Webforms but it look to me like you are using the default options and if there is no data that return in the query then you will not see the PagerTemplate.
1. execute the SP from the SSMS.
2. make sure that you pass the correct @status while executing the SP from the ASPX.
3. check the SQL Server profiler, what query the SQL Server got.
4. Check if DataTable (dt) has data after filling it. else you do not get the "DataBind" part, and the PagerTemplate will not display.
* The basic code look ok in fast review. I might missed something. You should monitor it and get the line that make the issue.
Ronen Ariely
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Multiple writes possible in DS in labview but not in CVI?

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