ArgumentNullException was Unhandled

heey you guys,
I have this error and I dont know How I can Solve it,
this.timer1 = new System.Windows.Forms.Timer(this.components); // its about this line of code
Does anybody know the solution to this error??
thkns

Create the Timer after the call to InitializeComponent():
public Form1()
InitializeComponent();
this.timer1 = new System.Windows.Forms.Timer(this.components);
Or use the constructor overload that doesn't take any argument:
this.timer1 = new System.Windows.Forms.Timer();
Please remember to close your threads by marking helpful posts as answer and please start a new thread if you have a new question.

Similar Messages

Crystal Report 11 error "AccessViolationException was unhandled" on windows

We have migrated VB code to VS 2010. We are using Crystal Report 11 with Visual Studio 2010, Crystal report is working fine with other Windows OS but not working in Windows 7 OS it throws an error "AccessViolationException was unhandled". We are using Crystal Report viewer, the error stops at the viewer control and gives the above error. Please let me know what is the solution for this
Note: All admin rights has been given to system

Only version of CR runtime supported in VS 2010 is Cr for VS 2010:
http://downloads.businessobjects.com/akdlm/cr4vs2010/CRforVS_13_0_1.exe
Thank you
Don

ExternalException was unhandled : A generic error occurred in GDI+.

I am try to save this bitmap as jpg file for every 5 sec. It works fine at another application, before I move this method to another app. The error message shows ExternalException was unhandled : A generic error occurred in GDI+. I do not know if
it is write permission issure or anything else. Since I use same computer and try to save at same file path, the error message keep going. I think I need help.
The error code:
public void captureScreen()
bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Debug.WriteLine("width:{0}, height:{1}", Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
gfxScreenshot = Graphics.FromImage(bmpScreenshot);
gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
//Save the screenshot to the specified path that the user has chosen
i++;
string i1 = Convert.ToString(i);
string name = "good" + i1 + ".jpg";
ImageCodecInfo jpg = GetEncoder(ImageFormat.Jpeg);
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder,
50L);
myEncoderParameters.Param[0] = myEncoderParameter;
bmpScreenshot.Save(name, jpg,
myEncoderParameters);
Bitmap bitmap = new Bitmap(name);
System.Drawing.Image image = (System.Drawing.Image)bitmap;
The error shows here:
bmpScreenshot.Save(name, jpg,
myEncoderParameters);
And Only alow me save one jpg, then pop up error

Hi
Since I can't reproduce your issue with some
undefined code.
Just take a look at from
Graphics.FromImage Method
in MSDN document.
You should always call the Dispose method to release the
Graphics and related resources created by the
FromImage method. Please try and test it again.
If still can't resolve, please post the complete code. Thanks.
Have a nice day！
Kristin
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InvalidCastException was unhandled

Hi,
working with some in-house developed software, and after installing, and then uninstalling, a patch for VS2010, I suddenly get an "InvalidCastException was unhandled"
The software is built on CodedUI, and the error appears when running the line
bw = BrowserWindow.Launch(data);
The broswerwindow is opened, and the error is thrown before the next line is interpreted.
The error text reads:
Unable to cast COM object of type 'Microsoft.VisualStudio.TestTools.UITest.Extension.IE.Communication.Interop.IECommunicatorClass' to interface type 'Microsoft.VisualStudio.TestTools.UITest.Extension.IE.Communication.Interop.IIECommunicator'. This operation
failed because the QueryInterface call on the COM component for the interface with IID '{95D738E9-E1F4-45EB-9DFF-E39671AF0CB7}' failed due to the following error: Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED)).
Anyone have an idea?

Hi HakonRamanujan,
>>Get the same message when trying to record steps with CodedUI, when trying to access some controls on web pages.
Do you mean that you still get this issue if you record a simple coded UI test? I mean that whether all coded UI tests have the same issue, maybe you could install the VS2010 sp1. Test it again.
Please also make sure that the Coded UI test supports these controls.
https://msdn.microsoft.com/en-us/library/dd380742(v=vs.100).aspx
In addition, whether you recorded the test in the latest version like VS2013 before? Maybe you could test it in VS2013 version.
Best Regards,
Jack
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TypeInitializationException was unhandled

Hello,
I was able to successfully compile this program, but received this error message when trying to debug.
Can anyone provide any help or advice on how to best go about resolving this?
Kenny

Hi Kenny,
It showed the exception window since we enabled the exception thrown under Debug->Exception window.
But the real issue would be related to your project code.
Reference:
http://stackoverflow.com/questions/4110168/c-sharp-error-when-i-try-to-compile
http://stackoverflow.com/questions/5179156/system-typeinitializationexception-was-unhandled
Like above two cases, you would look at the detailed inner exception to find out where the real problem is.
Best Regards,
Jack
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Need help with Connect 4 game, IndexOutOfRangeException was unhandled

Hi! I've been struggling with this for a while now, the issue is that as soon i move a game piece to the field i get this errorats "IndexOutOfRangeException was unhandled" and i don't know why since my intention with the code was to use for loops
look through the 2D array thats based on two constants: BOARDSIZEx = 9 and BOARDSIZEy = 6. Instead of traditional 7*6 connect 4 grid i made it 9 squares wide due to having pieces on the side to drag and drop.
Here's the code for my checkwin:
public bool checkWin(Piece[,] pieceArray, bool movebool)
bool found = false;
//Horizontal
for (int i = 0; i < BOARDSIZEx - 3; i++)
for (int j = 0; j < BOARDSIZEy; j++)
if ((pieceArray[i, j] != null)
&& (pieceArray[i, j] == pieceArray[i, j + 1])
&& (pieceArray[i, j] == pieceArray[i, j + 2])
&& (pieceArray[i, j] == pieceArray[i, j + 3]))
if (pieceArray[i, j].IsStarter != movebool)
found = true;
goto Done; //interesting way of getting out of nested for loop
//for more on goto: http://stackoverflow.com/questions/324831/breaking-out-of-a-nested-loop
//Vertikal
for (int i = 0; i < BOARDSIZEx; i++)
for (int j = 0; j < BOARDSIZEy - 3; j++)
if ((pieceArray[i, j] != null)
&& (pieceArray[i, j] == pieceArray[i + 1, j]) && (pieceArray[i, j] == pieceArray[i + 2, j])
&& (pieceArray[i, j] == pieceArray[i + 3, j]))
if (pieceArray[i, j].IsStarter != movebool)
found = true;
goto Done; //interesting way of getting out of nested for loop
//for more on goto: http://stackoverflow.com/questions/324831/breaking-out-of-a-nested-loop
//Diagonal, Lower left to upper right
for (int i = 0; i < BOARDSIZEx - 3; i++)
for (int j = 0; j < BOARDSIZEy - 3; j++)
if ((pieceArray[i, j] != null)
&& (pieceArray[i, j] == pieceArray[i + 1, j +1])
&& (pieceArray[i, j] == pieceArray[i + 2, j + 2])
&& (pieceArray[i, j] == pieceArray[i + 3, j + 3]))
if (pieceArray[i, j].IsStarter != movebool)
found = true;
goto Done; //interesting way of getting out of nested for loop
//for more on goto: http://stackoverflow.com/questions/324831/breaking-out-of-a-nested-loop
//Diagonal, upper left to lower right
for (int i = 0; i >= BOARDSIZEx; i--)
for (int j = 0; j < BOARDSIZEy - 3; j++)
if ((pieceArray[i, j] != null)
&& (pieceArray[i, j] == pieceArray[i - 1, j + 1])
&& (pieceArray[i, j] == pieceArray[i - 2, j + 2])
&& (pieceArray[i, j] == pieceArray[i - 3, j +3]))
if (pieceArray[i, j].IsStarter != movebool)
found = true;
goto Done; //interesting way of getting out of nested for loop
//for more on goto: http://stackoverflow.com/questions/324831/breaking-out-of-a-nested-loop
Done:
return !found;
It's at the vertical check that the error occurs and also my checkwin doesnt seem to respond to the call in the game.cs code.
//check for win
bool moveBool = true; //returns yes or no depending on whether both players have moved their pieces
if (move % 2 == 0) moveBool = false;
bool win = rules.checkWin(pieceArray, moveBool);
//The game is won!
if (win)
string winningPlayerName = player1.Name; //creating a new player instance, just for shortening the code below
if (moveBool == false) winningPlayerName = player2.Name; //if it was player 2 who won, the name changes
message = winningPlayerName + " has won the game!\n\n"; //The name of the player
Board.PrintMove(message); //Print the message
if (moveBool == true) player1.Score += 1; else player2.Score += 1; //update score for the players
//The player's labels get their update texts (score)
Board.UpdateLabels(player1, player2);
//Here, depending on what one wants to do, the board is reset etc.
else
move++; //draw is updated
And here's a picture on how it looks like at the moment.
Thanks in Advance!
Student at the University of Borås, Sweden

for (int i = 0; i < BOARDSIZEx; i++) // If BOARDSizex is the number of elements in the first dimension...
for (int j = 0; j < BOARDSIZEy - 3; j++)
if ((pieceArray[i, j] != null)
&& (pieceArray[i, j] == pieceArray[i + 1, j]) && (pieceArray[i, j] == pieceArray[i + 2, j])
&& (pieceArray[i, j] == pieceArray[i + 3, j])) // Then [i + anything, j] will be out of range.
You probably meant to add the one, two, or three to the j rather than the i.

DirectoryNotFoundException was unhandled by user code

I have taken over a pre-existing application from the previous developer. I was able to successfully compile the application, but when I attempt to debug the application I receive the error message below:
Does anyone have an idea what this is referring to and how to resolve it?
Thanks,
Kenny

Hi Kenny,
Which kind of project did you debug?
>>An unhandled exception of type 'System.IO.DirectoryNotFoundException' occurred in mscorlib.dll
Additional information: Could not find a part of the path...
Generally the error message means that it would be related to the resources management.
Reference:
http://stackoverflow.com/questions/4216396/system-io-directorynotfoundexception-after-deleting-an-empty-folder-and-recreati
https://social.msdn.microsoft.com/Forums/vstudio/en-US/6eacf70d-f229-4cc1-8868-fba98008455a/c-systemiodirectorynotfoundexception-after-deleting-an-empty-folder-and-recreating-it?forum=csharpgeneral
Maybe you could click "View Detail" to get more information in your side, but I doubt that it would be not the VS IDE issue.
Best Regards,
Jack
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NullReferenceException was unhandled

I am Building a Webbrowser in C#: this is the code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Web_Browser
public partial class Form1 : Form
public Form1()
InitializeComponent();
private void goButton_Click(object sender, EventArgs e)
webBrowser1.Navigate(new Uri(comboBox1.SelectedItem.ToString()));
private void homeToolStripMenuItem_Click(object sender, EventArgs e)
webBrowser1.GoHome();
private void goBackToolStripMenuItem_Click(object sender, EventArgs e)
webBrowser1.GoForward();
private void goForwardToolStripMenuItem_Click(object sender, EventArgs e)
webBrowser1.GoBack();
private void Form1_Load(object sender, EventArgs e)
comboBox1.SelectedText = "0";
webBrowser1.GoHome();
the problem is: when I run it I get this error
"NullReferenceException was unhandeled"
at the bold line
can someone explane to me what I need to do??

Hi programming,
I have reproduced your code, and I was wondering what operation you made. If you debug your project and click the “goButton” after the form_load, it would appear the error message. It was becase your call the “comboBox1.SelectedItem” and “comboBox1.SelectedItem”
was never set. I think you could modify your Form1_Load like below:
private void Form0109_Load(object sender, EventArgs e)
//comboBox1.SelectedText = "0";
comboBox1.SelectedItem = comboBox1.Items[0];
webBrowser1.GoHome();
It would be helpful if you could share us how you get the error message.
Best Regards,
Edward
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InvalidOperationException was unhandled by user code

Hi,
I'm trying to validate the date format of the command using these codes. But I'm with the captioned error? Any advice for it?
protected void gv_upd_rec(object sender, GridViewUpdateEventArgs e)
int rIndex = e.RowIndex;
OracleConnection conn = new OracleConnection("Data Source=XE;User ID=my_schema;Password=wsabc;");
OracleDataReader reader;
string start_date = gv1.Rows[rIndex].Cells[1].Text;
string end_date = gv1.Rows[rIndex].Cells[2].Text;
try
OracleCommand cmd = new OracleCommand("select to_date(:start_date,'dd/Mon/rr'),to_date(:end_date,'dd/Mon/rr') from dual", conn);
cmd.Parameters.AddWithValue("start_date", OracleType.VarChar).Value = start_date;
cmd.Parameters.AddWithValue("end_date", OracleType.VarChar).Value = end_date;
reader = cmd.ExecuteReader();
catch (OracleException ex)
ClientScript.RegisterClientScriptBlock(Page.GetType(), "alert", "alert('Invalid date format is entered: " + ex.Message + ".');", true);
return;
finally
}

Hi,
You're using Microsoft's data provider, not Oracle's, so a Microsoft forum may be a better place to post your problem.
However, I did try this, and it worked fine for me:
using (OracleConnection con = new OracleConnection("user id=scott;password=tiger;data source=orcl"))
            con.Open();
            using (OracleCommand cmd = new OracleCommand("", con))
                cmd.CommandText = "select to_date(:start_date,'dd/Mon/rr'),to_date(:end_date,'dd/Mon/rr') from dual";
                cmd.Parameters.AddWithValue("start_date", OracleType.VarChar).Value = "01/JAN/02";
                cmd.Parameters.AddWithValue("end_date", OracleType.VarChar).Value = "01/JAN/08";
                OracleDataReader reader = cmd.ExecuteReader();
                Console.WriteLine(cmd.ExecuteScalar().ToString());
        }OUTPUT
======
1/1/2002 12:00:00 AM
I'm not sure why you're calling both ExecuteReader() and ExecuteScalar(), I assume that's just for debugging purposes?
Greg

CRVS2010 Beta - Crystal Reports System.ArgumentNullException was unhan

I am trying to publish my first Windows WFP application. Everything works fine on my development machine, but when it gets to the point where the Crystal Reports viewer loads the Report Layout, the computer I have installed it on throws a error and stops.
I have defined my report file locations as (I have tried both options, and both work on my development system) :
Dim strReportName As String = "ExceptionRpt"
Dim strReportPath As String = "C:\Users\john\documents\visual studio 2010\Projects\StatusReportsCRWPF\StatusReportsCRWPF" & "\ExceptionReports\" & strReportName & ".rpt"
Dim strReportPath As String = "
files\data\john\CrystalRpts\ExceptionReports\" & strReportName & ".rpt"
Dim report As ExcpReport = New ExcpReport
Dim DS As DataSet = New DataSet
Dim strLoadDS As String = "Select * from StatusException"
Dim cmdLoadDS As New SqlCommand(strLoadDS)
Dim dtLoadDS As DataTable = GetDataPL(cmdLoadDS)
DS.Tables.Add(dtLoadDS)
ReportsViewer.ShowRefreshButton = True
ReportsViewer.ViewerCore.DataContext = DS.Tables(0)
(Placed to find the fine that errors out)
MsgBox("Just Before the Crystal Report Viewer Activation " + strReportPath, MsgBoxStyle.Question)
ReportsViewer.ViewerCore.ReportSource = strReportPath
Any help in correcting this problem would be greatly appreciated
Edited by: Ludek Uher on May 28, 2010 2:45 PM

I do not believe you will be able to deploy this app. There is no CR 2010 runtime that would support WPF available. The only runtime is based on CR 2008 redirect (lots of info on that in these forums).
Ludek
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IndexOutOfRangeException was unhandled

Good Day,
Hi to all Expert, i have some problem with my code, but basically its just a reading a data from the database but bug still pop-up, see the image
The "no_days" field is exist, when i'm using insert and update statement is still working but when i retrieve it the bug stay stood, please help me,
Thanks in advance,

Hi Mr. Monkeyboy,
Sorry for the unspecific sources, here's the code,
dbsql("select * from personalinfo where refid=1")
dr = sqlCmd.ExecuteReader(CommandBehavior.CloseConnection)
While dr.Read
cmbRefStatus.Text = dr("refstatus").ToString
txtRefDateReg.Text = dr("datereg").ToString
txtRefAttn.Text = dr("attn").ToString
txtRefPurpose.Text = dr("purpose").ToString
txtClassNo.Text = Int(dr("class_no")) 'bug upon here "no_days" but the data values is 5
numNoOfDays.Value = dr("no_days")
txtEndDate.Text = DateTime.Parse(dr("enddate").ToString).Date
txtRefLname.Text = dr("lastname").ToString
txtRefFname.Text = dr("firstname").ToString
txtRefMname.Text = dr("middlename").ToString
dtpRefbirthdate.Value = dr("birthdate").ToString
cmbRefSex.Text = dr("sex").ToString
txtRefCountry.Text = dr("country")
txtRefCity.Text = dr("city").ToString
txtRefAddr1.Text = dr("addr1").ToString
txtRefAddr2.Text = dr("addr2").ToString
txtRefPhone.Text = dr("phone").ToString
txtRefTel.Text = dr("telphone").ToString
txtRefEmail.Text = dr("email").ToString
txtRefCompany.Text = dr("company").ToString
txtRefCoAddr.Text = dr("coaddr").ToString
txtRefCoPhone.Text = dr("cophone").ToString
txtRefCoTel.Text = dr("cotelphone").ToString
txtRefCoEmail.Text = dr("coemail").ToString
End While
I'm using sql server,
numNoOfDays.Value = dr("no_days")
'Data from no_days=5
'the numNoOfDays.Value range is from 0 to 100

ArgumentException was unhandled by user code

Hi,
I am a new user of ODP.net and Oracle. I have a stored procedure whose in parameter is UDT. It is a table of type Object. I need to know what would be its equivalent in .Net?
E.g.
create or replace
TYPE TEMP_OBJ AS OBJECT (
a_id number,
Name varchar2(256),
flag char(1),
user varchar2(256) )
create or replace
type ACTUALONE is table of TEMP_OBJ
procedure submit_proc
(i_actual in actualone,
o_status out number,
o_err_message out varchar2);
How do I map my oracle fields with the C#.Net. What do I do to execute the above stored procedure i.e. "submit_proc" from my .Net code? I want a code or explanation on how to ride on this beast.

837779 wrote:
Hi Alex,
I do not intend to do this stuffs from UI. The link that you have sent me would have been of gr8 help if I had to do it by UI. I want to code my entire requirement and I cannot add the server in the .Net as I do have the tns entries in my .ora file and I am not even allowed to do that. So please if you can send in some code that can explain me the solution to my problem.You should at least read through the walkthrough Alex provided you even if it involves UI elements. It includes the information you are looking for in the "Generating Custom Classes for User-Defined Types" section.

Entityexception was unhandled by user code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcDemo.Models;
namespace MvcDemo.Controllers
public class EmployeeController : Controller
public ActionResult Details( int id )
EmployeeContext employeeContext = new EmployeeContext();
Employee employee = employeeContext.Employees.Single(emp => emp.EmployeeId == id); //when i debugg this project then this error line occurred at this line
return View(employee);
i try to retrive data from the table and by id column

Well you need to find out what the error is and post it, because otherwise, only Harry Houdini can pull that rabbit out of the hat for you.
Harry would put a try/catch around the code and catch the exception and pull the rabbit out by its ears.

StackOverflowException was unhandled when I set the datacontext of xaml to the partial class?

<Page x:Class="GraphToTable.Page1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:src="clr-namespace:GraphToTable"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="1200" Width="auto" Height="auto"
Title="Page1">
<Page.DataContext>
<src:Page1/>
</Page.DataContext>
Does this means that I cannot set the datacontext from xaml to same class that it's referring to?

Hi Boppy,
It can be set to DeatContext at only design time using d:DataContext , and can be set at run time using RelativeSource.
<Page x:Class="GraphToTable.Page1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:src="clr-namespace:GraphToTable"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="1200" Width="auto" Height="auto" Title="Page1"
d:DataContext="{d:DesignInstance Type=src:Page1}"
DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}">
<Grid>
<TextBlock Text="{Binding Path=ActualHeight}" />
</Grid>
</Page>
個別に明示されていない限りgekkaがフォーラムに投稿したコードにはフォーラム使用条件に基づき「MICROSOFT LIMITED PUBLIC LICENSE」が適用されます。(かなり自由に使ってOK!)

[Solved]app.manifest high dpi problem

Hello,
I'm trying to add these lines to my app.I was added and it run sucessfull without debug.But when i press f5(debug) it gives me a error.
System.ArgumentNullException was unhandled
Message: An unhandled exception of type 'System.ArgumentNullException' occurred in mscorlib.dll
Additional information: Value cannot be null
My app.manifest code;
<application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings>
<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
</windowsSettings>
</application>
I just added this because of report viewer shows wrong.
I can run my app without debug, but cant run with debug option.When i press f5 it gives these errors and stops app.
By the way i can run my app outside of visual studio.
How can i fix this problem ?
Thanks...
Mustibh www.mbpakalin.net

Solved problem by,
Project Options > Debug > Enable the Visual Studio hosting process(disable it run app later enable it again)
fixes mine, i don't know why gives error like this but this solves my problem :)
Mustibh www.mustibh.tk
You should propose your post as the answer to end this thread.
Although when you altered the apps manifest did you clean and rebuild the app or clean and build the app to see if that corrected the issue?
La vida loca

ArgumentNullException was Unhandled

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