473,835 Members | 1,882 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

System.NullRefe renceException

I am doing some of the C# walkthroughs to transition from
VB to C#. When I try to execute

static void Main()
{
Aplication.Run( new Form1())
}

I raise a 'System.NullRef erenceException " in
system.windows. forms.dll

I am sure this is a simple fix, but I cannot find a answer.

Terrence
Jul 19 '05 #1
3 9149
Can you post the rest of your code? Without it, it's difficult to tell
what's going on....

Thanks,
- bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft

Your Potential. Our Passion.

This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only, so that others may benefit. Thanks.
--------------------
Content-Class: urn:content-classes:message
From: "Terrence" <tr********@hot mail.com>
Sender: "Terrence" <tr********@hot mail.com>
Subject: System.NullRefe renceException
Date: Wed, 2 Jul 2003 20:14:49 -0700
Lines: 14
Message-ID: <08************ *************** *@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
Thread-Index: AcNBEUNX0JWNsBA cSKah7zscfgzN3g ==
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Newsgroups: microsoft.publi c.dotnet.genera l
Path: cpmsftngxa09.ph x.gbl
Xref: cpmsftngxa09.ph x.gbl microsoft.publi c.dotnet.genera l:14499
NNTP-Posting-Host: TK2MSFTNGXA09 10.40.1.161
X-Tomcat-NG: microsoft.publi c.dotnet.genera l

I am doing some of the C# walkthroughs to transition from
VB to C#. When I try to execute

static void Main()
{
Aplication.Run (new Form1())
}

I raise a 'System.NullRef erenceException " in
system.windows .forms.dll

I am sure this is a simple fix, but I cannot find a answer.

Terrence


Jul 19 '05 #2
Thanks for posting the code. It appears as though there's a bug in the
InitializeCompo nent method. You may want to take a look at the book
publisher's or author's web site to see if there's some erratta information
with corrections to the code.

Unfortunately I can't tell what's going on without even more information
regarding external references to things such as
AuthorsWinClien t.localhost.aut hors1

Good luck!
-bliz

--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft

Your Potential. Our Passion.

This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only, so that others may benefit. Thanks.
--------------------
Content-Class: urn:content-classes:message
From: "Terrence" <tr********@hot mail.com>
Sender: "Terrence" <tr********@hot mail.com>
References: <08************ *************** *@phx.gbl> <zH************ *@cpmsftngxa09. phx.gbl>Subject: RE: System.NullRefe renceException
Date: Thu, 3 Jul 2003 07:10:32 -0700
Lines: 319
Message-ID: <0c************ *************** *@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Thread-Index: AcNBbN3Ax2+BDkE pRLCp7Qep1YyJAw ==
Newsgroups: microsoft.publi c.dotnet.genera l
Path: cpmsftngxa09.ph x.gbl
Xref: cpmsftngxa09.ph x.gbl microsoft.publi c.dotnet.genera l:14548
NNTP-Posting-Host: TK2MSFTNGXA11 10.40.1.163
X-Tomcat-NG: microsoft.publi c.dotnet.genera l

Here is the code; I will mark the line where the execution
stops with <====

Also, I have included the contents of the Debug window
following the code.
============== ============== CODE =============== =======
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;

namespace AuthorsWinClien t
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class frmMain : System.Windows. Forms.Form
{
private System.Windows. Forms.DataGrid
dataGrid1;
private System.Windows. Forms.Button
SaveData;
private System.Windows. Forms.Button
LoadData;
private
AuthorsWinClie nt.localhost.au thors1 AuthorData;
/// <summary>
/// Required designer variable.
/// </summary>
private System.Componen tModel.Containe r
components = null;

public frmMain()
{
//
// Required for Windows Form
Designer support
//
InitializeCompo nent();

//
// TODO: Add any constructor code
after InitializeCompo nent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool
disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose
();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated
code
/// <summary>
/// Required method for Designer support -
do not modify
/// the contents of this method with the
code editor.
/// </summary>
private void InitializeCompo nent()
{
this.dataGrid1 = new
System.Windows .Forms.DataGrid ();
this.AuthorData = new
AuthorsWinClie nt.localhost.au thors1();
this.SaveData = new
System.Windows .Forms.Button() ;
this.LoadData = new
System.Windows .Forms.Button() ;

((System.Compon entModel.ISuppo rtInitialize)
(this.dataGrid 1)).BeginInit() ;

((System.Compon entModel.ISuppo rtInitialize)
(this.AuthorDa ta)).BeginInit( );
this.SuspendLay out();
//
// dataGrid1
//
this.dataGrid1. DataMember
= "authors";
this.dataGrid1. DataSource =
this.AuthorDat a;
this.dataGrid1. HeaderForeColor =
System.Drawing .SystemColors.C ontrolText;
this.dataGrid1. Location = new
System.Drawing .Point(8, 8);
this.dataGrid1. Name = "dataGrid1" ;
this.dataGrid1. Size = new
System.Drawing .Size(344, 184);
this.dataGrid1. TabIndex = 0;
//
// AuthorData
//
this.AuthorData .DataSetName
= "authors1";
this.AuthorData .Locale = new
System.Globali zation.CultureI nfo("en-US");
//
// SaveData
//
this.SaveData.L ocation = new
System.Drawing .Point(216, 208);
this.SaveData.N ame = "SaveData";
this.SaveData.S ize = new
System.Drawing .Size(96, 24);
this.SaveData.T abIndex = 1;
this.SaveData.T ext = "Save";
this.SaveData.C lick += new
System.EventHa ndler(this.Save Data_Click);
//
// LoadData
//
this.LoadData.L ocation = new
System.Drawing .Point(40, 208);
this.LoadData.N ame = "LoadData";
this.LoadData.S ize = new
System.Drawing .Size(80, 24);
this.LoadData.T abIndex = 2;
this.LoadData.T ext = "Load";
this.LoadData.C lick += new
System.EventHa ndler(this.Load Data_Click);
//
// frmMain
//
this.AutoScaleB aseSize = new
System.Drawing .Size(5, 13);
this.ClientSize = new
System.Drawing .Size(360, 245);
this.Controls.A dd(this.LoadDat a);
this.Controls.A dd(this.SaveDat a);
this.Controls.A dd(this.dataGri d1);
this.Name = "frmMain";
this.Text = "Form Main";

((System.Compon entModel.ISuppo rtInitialize)
(this.dataGrid 1)).EndInit();

((System.Compon entModel.ISuppo rtInitialize)
(this.AuthorDa ta)).EndInit();
this.ResumeLayo ut(false);

}
#endregion

/// <summary>
/// The main entry point for the
application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run (new frmMain());
} <==== Exception Thrown

private void LoadData_Click( object sender,
System.EventAr gs e)
{

AuthorsWinClien t.localhost.Aut horsService ws =
new
AuthorsWinClie nt.localhost.Au thorsService();
ws.Credentials =
System.Net.Cre dentialCache.De faultCredential s;
AuthorData.Merg e(ws.GetAuthors ());
}

private void SaveData_Click( object sender,
System.EventAr gs e)
{

AuthorsWinClien t.localhost.Aut horsService ws =
new
AuthorsWinClie nt.localhost.Au thorsService();
ws.Credentials =
System.Net.Cre dentialCache.De faultCredential s;

AuthorsWinClien t.localhost.aut hors1 diffAuthors =
new
AuthorsWinClie nt.localhost.au thors1();
diffAuthors.Mer ge
(AuthorData.Ge tChanges());
diffAuthors = ws.UpdateAuthor s
(diffAuthors );
AuthorData.Merg e(diffAuthors);
}
}
}
============== ========= DEBUG =============== ===========
'DefaultDomain ':
Loaded 'c:\winnt\micro soft.net\framew ork\v1.1.4322
\mscorlib.dll' , No symbols loaded.
'AuthorsWinCli ent': Loaded 'C:\Documents and
Settings\tdani el\My Documents\Visua l Studio
Projects\Autho rWebService\Aut horsWinClient\b in\Debug\Author
sWinClient.exe ', Symbols loaded.
'AuthorsWinCli ent.exe':
Loaded 'c:\winnt\assem bly\gac\system. windows.forms\1 .0.5000
.0__b77a5c5619 34e089\system.w indows.forms.dl l', No symbols
loaded.
'AuthorsWinCli ent.exe':
Loaded 'c:\winnt\assem bly\gac\system\ 1.0.5000.0__b77 a5c5619
34e089\system. dll', No symbols loaded.
'AuthorsWinCli ent.exe':
Loaded 'c:\winnt\assem bly\gac\system. drawing\1.0.500 0.0__b0
3f5f7f11d50a3a \system.drawing .dll', No symbols loaded.
'AuthorsWinCli ent.exe':
Loaded 'c:\winnt\assem bly\gac\system. data\1.0.5000.0 __b77a5
c561934e089\sy stem.data.dll', No symbols loaded.
'AuthorsWinCli ent.exe':
Loaded 'c:\winnt\assem bly\gac\system. xml\1.0.5000.0_ _b77a5c
561934e089\sys tem.xml.dll', No symbols loaded.
An unhandled exception of
type 'System.NullRef erenceException ' occurred in
system.windows .forms.dll

Additional information: Object reference not set to an
instance of an object.
Unhandled Exception: System.NullRefe renceException: Object
reference not set to an instance of an object.
at System.Windows. Forms.SafeNativ eMethods.ShowWi ndow
(HandleRef hWnd, Int32 nCmdShow)
at System.Windows. Forms.Control.S etVisibleCore(B oolean
value)
at System.Windows. Forms.Form.SetV isibleCore(Bool ean
value)
at System.Windows. Forms.Control.s et_Visible(Bool ean
value)
at
System.Windows .Forms.ThreadCo ntext.RunMessag eLoopInner
(Int32 reason, ApplicationCont ext context)
at System.Windows. Forms.ThreadCon text.RunMessage Loop
(Int32 reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at AuthorsWinClien t.frmMain.Main( ) in c:\documents and
settings\tdani el\my documents\visua l studio
projects\autho rwebservice\aut horswinclient\f orm1.cs:line
121The program '[3084] AuthorsWinClien t.exe' has exited
with code 0 (0x0).

-----Original Message-----
Can you post the rest of your code? Without it, it's

difficult to tell
what's going on....

Thanks,
- bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft

Your Potential. Our Passion.

This posting is provided "AS IS" with no warranties, and

confers no rights.
Please reply to newsgroups only, so that others may

benefit. Thanks.


--------------------
Content-Class: urn:content-classes:message
From: "Terrence" <tr********@hot mail.com>
Sender: "Terrence" <tr********@hot mail.com>
Subject: System.NullRefe renceException
Date: Wed, 2 Jul 2003 20:14:49 -0700
Lines: 14
Message-ID: <08************ *************** *@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
Thread-Index: AcNBEUNX0JWNsBA cSKah7zscfgzN3g ==
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Newsgroups : microsoft.publi c.dotnet.genera l
Path: cpmsftngxa09.ph x.gbl
Xref: cpmsftngxa09.ph x.gblmicrosoft.publ ic.dotnet.gener al:14499NNTP-Posting-Host: TK2MSFTNGXA09 10.40.1.161
X-Tomcat-NG: microsoft.publi c.dotnet.genera l

I am doing some of the C# walkthroughs to transitionfromVB to C#. When I try to execute

static void Main()
{
Aplication.R un(new Form1())
}

I raise a 'System.NullRef erenceException " in
system.windo ws.forms.dll

I am sure this is a simple fix, but I cannot find aanswer.
Terrence


.


Jul 19 '05 #3
Let me take a look at the sample app.

Thanks,
- bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft

Your Potential. Our Passion.

This posting is provided "AS IS" with no warranties, and confers no rights.
Please reply to newsgroups only, so that others may benefit. Thanks.
--------------------
Content-Class: urn:content-classes:message
From: "Terrence" <tr********@hot mail.com>
Sender: "Terrence" <tr********@hot mail.com>
References: <08************ *************** *@phx.gbl> <zH************ *@cpmsftngxa09. phx.gbl>
<0c************ *************** *@phx.gbl>
<X4************ **@cpmsftngxa09 .phx.gbl>Subject: RE: System.NullRefe renceException
Date: Thu, 3 Jul 2003 08:01:12 -0700
Lines: 397
Message-ID: <50************ *************** *@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
Thread-Index: AcNBc/GGEtBG3tHWTS2AU 6Ql41txxg==
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Newsgroups: microsoft.publi c.dotnet.genera l
Path: cpmsftngxa09.ph x.gbl
Xref: cpmsftngxa09.ph x.gbl microsoft.publi c.dotnet.genera l:14562
NNTP-Posting-Host: TK2MSFTNGXA12 10.40.1.164
X-Tomcat-NG: microsoft.publi c.dotnet.genera l

Jim,

This is the code from MS VS.NET 2003 documentation/C#
Walkthrough/Simple Distributed App - Typed verbatim. I
have done the same walkthrough using VS.NET (on home box)
and it ran. Any thoughts?
-----Original Message-----
Thanks for posting the code. It appears as though

there's a bug in the
InitializeCom ponent method. You may want to take a look

at the book
publisher's or author's web site to see if there's some

erratta information
with corrections to the code.

Unfortunate ly I can't tell what's going on without even

more information
regarding external references to things such as
AuthorsWinCli ent.localhost.a uthors1

Good luck!
-bliz

--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft

Your Potential. Our Passion.

This posting is provided "AS IS" with no warranties, and

confers no rights.
Please reply to newsgroups only, so that others may

benefit. Thanks.


--------------------
Content-Class: urn:content-classes:message
From: "Terrence" <tr********@hot mail.com>
Sender: "Terrence" <tr********@hot mail.com>
References : <08************ *************** *@phx.gbl>

<zH********** ***@cpmsftngxa0 9.phx.gbl>
Subject: RE: System.NullRefe renceException
Date: Thu, 3 Jul 2003 07:10:32 -0700
Lines: 319
Message-ID: <0c************ *************** *@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Thread-Index: AcNBbN3Ax2+BDkE pRLCp7Qep1YyJAw ==
Newsgroups : microsoft.publi c.dotnet.genera l
Path: cpmsftngxa09.ph x.gbl
Xref: cpmsftngxa09.ph x.gblmicrosoft.publ ic.dotnet.gener al:14548NNTP-Posting-Host: TK2MSFTNGXA11 10.40.1.163
X-Tomcat-NG: microsoft.publi c.dotnet.genera l

Here is the code; I will mark the line where theexecutionstops with <====

Also, I have included the contents of the Debug window
following the code.
============ =============== = CODE =============== =======
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;

namespace AuthorsWinClien t
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class frmMain : System.Windows. Forms.Form
{
private System.Windows. Forms.DataGrid
dataGrid1;
private System.Windows. Forms.Button
SaveData;
private System.Windows. Forms.Button
LoadData;
private
AuthorsWinCl ient.localhost. authors1 AuthorData;
/// <summary>
/// Required designer variable.
/// </summary>
private System.Componen tModel.Containe r
components = null;

public frmMain()
{
//
// Required for Windows Form
Designer support
//
InitializeCompo nent();

//
// TODO: Add any constructor code
after InitializeCompo nent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool
disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose
();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated
code
/// <summary>
/// Required method for Designer support -
do not modify
/// the contents of this method with the
code editor.
/// </summary>
private void InitializeCompo nent()
{
this.dataGrid1 = new
System.Windo ws.Forms.DataGr id();
this.AuthorData = new
AuthorsWinCl ient.localhost. authors1();
this.SaveData = new
System.Windo ws.Forms.Button ();
this.LoadData = new
System.Windo ws.Forms.Button ();

((System.Compon entModel.ISuppo rtInitialize)
(this.dataGr id1)).BeginInit ();

((System.Compon entModel.ISuppo rtInitialize)
(this.Author Data)).BeginIni t();
this.SuspendLay out();
//
// dataGrid1
//
this.dataGrid1. DataMember
= "authors";
this.dataGrid1. DataSource =
this.AuthorD ata;
this.dataGrid1. HeaderForeColor =
System.Drawi ng.SystemColors .ControlText;
this.dataGrid1. Location = new
System.Drawi ng.Point(8, 8);
this.dataGrid1. Name = "dataGrid1" ;
this.dataGrid1. Size = new
System.Drawi ng.Size(344, 184);
this.dataGrid1. TabIndex = 0;
//
// AuthorData
//
this.AuthorData .DataSetName
= "authors1";
this.AuthorData .Locale = new
System.Globa lization.Cultur eInfo("en-US");
//
// SaveData
//
this.SaveData.L ocation = new
System.Drawi ng.Point(216, 208);
this.SaveData.N ame = "SaveData";
this.SaveData.S ize = new
System.Drawi ng.Size(96, 24);
this.SaveData.T abIndex = 1;
this.SaveData.T ext = "Save";
this.SaveData.C lick += new
System.Event Handler(this.Sa veData_Click);
//
// LoadData
//
this.LoadData.L ocation = new
System.Drawi ng.Point(40, 208);
this.LoadData.N ame = "LoadData";
this.LoadData.S ize = new
System.Drawi ng.Size(80, 24);
this.LoadData.T abIndex = 2;
this.LoadData.T ext = "Load";
this.LoadData.C lick += new
System.Event Handler(this.Lo adData_Click);
//
// frmMain
//
this.AutoScaleB aseSize = new
System.Drawi ng.Size(5, 13);
this.ClientSize = new
System.Drawi ng.Size(360, 245);
this.Controls.A dd(this.LoadDat a);
this.Controls.A dd(this.SaveDat a);
this.Controls.A dd(this.dataGri d1);
this.Name = "frmMain";
this.Text = "Form Main";

((System.Compon entModel.ISuppo rtInitialize)
(this.dataGr id1)).EndInit() ;

((System.Compon entModel.ISuppo rtInitialize)
(this.Author Data)).EndInit( );
this.ResumeLayo ut(false);

}
#endregion

/// <summary>
/// The main entry point for the
applicatio n.
/// </summary>
[STAThread]
static void Main()
{
Application.Run (new frmMain());
} <==== Exception Thrown

private void LoadData_Click( object sender,
System.Event Args e)
{

AuthorsWinClien t.localhost.Aut horsService ws =
new
AuthorsWinCl ient.localhost. AuthorsService( );
ws.Credentials =
System.Net.C redentialCache. DefaultCredenti als;
AuthorData.Merg e(ws.GetAuthors ());
}

private void SaveData_Click( object sender,
System.Event Args e)
{

AuthorsWinClien t.localhost.Aut horsService ws =
new
AuthorsWinCl ient.localhost. AuthorsService( );
ws.Credentials =
System.Net.C redentialCache. DefaultCredenti als;

AuthorsWinClien t.localhost.aut hors1 diffAuthors =
new
AuthorsWinCl ient.localhost. authors1();
diffAuthors.Mer ge
(AuthorData. GetChanges());
diffAuthors = ws.UpdateAuthor s
(diffAuthors );
AuthorData.Merg e(diffAuthors);
}
}
}
============ =========== DEBUG =============== ===========
'DefaultDoma in':
Loaded 'c:\winnt\micro soft.net\framew ork\v1.1.4322
\mscorlib.dl l', No symbols loaded.
'AuthorsWinC lient': Loaded 'C:\Documents and
Settings\tda niel\My Documents\Visua l Studio
Projects\Aut horWebService\A uthorsWinClient \bin\Debug\AuthorsWinClient.e xe', Symbols loaded.
'AuthorsWinC lient.exe':
Loaded 'c:\winnt\assem bly\gac\system. windows.forms\1 .0.5000.0__b77a5c56 1934e089\system .windows.forms. dll', Nosymbolsloaded.
'AuthorsWinC lient.exe':
Loaded 'c:\winnt\assem bly\gac\system\ 1.0.5000.0__b77 a5c561934e089\syste m.dll', No symbols loaded.
'AuthorsWinC lient.exe':
Loaded 'c:\winnt\assem bly\gac\system. drawing\1.0.500 0.0__b03f5f7f11d50a 3a\system.drawi ng.dll', No symbols loaded.
'AuthorsWinC lient.exe':
Loaded 'c:\winnt\assem bly\gac\system. data\1.0.5000.0 __b77a5c561934e089\ system.data.dll ', No symbols loaded.
'AuthorsWinC lient.exe':
Loaded 'c:\winnt\assem bly\gac\system. xml\1.0.5000.0_ _b77a5c561934e089\s ystem.xml.dll', No symbols loaded.
An unhandled exception of
type 'System.NullRef erenceException ' occurred in
system.windo ws.forms.dll

Additional information: Object reference not set to an
instance of an object.
Unhandled Exception: System.NullRefe renceException:Objectreference not set to an instance of an object.
at System.Windows. Forms.SafeNativ eMethods.ShowWi ndow
(HandleRef hWnd, Int32 nCmdShow)
at System.Windows. Forms.Control.S etVisibleCore(Booleanvalue)
at System.Windows. Forms.Form.SetV isibleCore(Bool ean
value)
at System.Windows. Forms.Control.s et_Visible(Bool ean
value)
at
System.Windo ws.Forms.Thread Context.RunMess ageLoopInner
(Int32 reason, ApplicationCont ext context)
at System.Windows. Forms.ThreadCon text.RunMessage Loop
(Int32 reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at AuthorsWinClien t.frmMain.Main( ) in c:\documentsandsettings\tda niel\my documents\visua l studio
projects\aut horwebservice\a uthorswinclient \form1.cs:line
121The program '[3084] AuthorsWinClien t.exe' has exited
with code 0 (0x0).
-----Original Message-----
Can you post the rest of your code? Without it, it's
difficult to tell
what's going on....

Thanks,
- bliz
--
Jim Blizzard
Sr .NET Developer Evangelist
Microsoft

Your Potential. Our Passion.

This posting is provided "AS IS" with no warranties,andconfers no rights.
Please reply to newsgroups only, so that others may
benefit. Thanks.
--------------------
>Content-Class: urn:content-classes:message
>From: "Terrence" <tr********@hot mail.com>
>Sender: "Terrence" <tr********@hot mail.com>
>Subject: System.NullRefe renceException
>Date: Wed, 2 Jul 2003 20:14:49 -0700
>Lines: 14
>Message-ID: <08************ *************** *@phx.gbl>
>MIME-Version: 1.0
>Content-Type: text/plain;
> charset="iso-8859-1"
>Content-Transfer-Encoding: 7bit
>X-Newsreader: Microsoft CDO for Windows 2000
>Thread-Index: AcNBEUNX0JWNsBA cSKah7zscfgzN3g ==
>X-MimeOLE: Produced By Microsoft MimeOLEV5.50.4910.030 0>Newsgroups : microsoft.publi c.dotnet.genera l
>Path: cpmsftngxa09.ph x.gbl
>Xref: cpmsftngxa09.ph x.gbl
microsoft.pu blic.dotnet.gen eral:14499
>NNTP-Posting-Host: TK2MSFTNGXA09 10.40.1.161
>X-Tomcat-NG: microsoft.publi c.dotnet.genera l
>
>I am doing some of the C# walkthroughs to transition
from
>VB to C#. When I try to execute
>
>static void Main()
>{
>Aplication .Run(new Form1())
>}
>
>I raise a 'System.NullRef erenceException " in
>system.win dows.forms.dll
>
>I am sure this is a simple fix, but I cannot find a
answer.
>
>Terrence
>

.


.


Jul 19 '05 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
536
by: Rafael | last post by:
Hi, I hope I can find some help for this problem IDE: Visual Studio.NET 2003 Developer Editio Language: C# Problem: "An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll. Additional information: Object reference not set to an instance of an object. Visual Studio's IDE is not allowing me to develop projects in C#... I've trying to create a simple Windows Forms project using Visual Studio.NET...
3
397
by: Terrence | last post by:
I am doing some of the C# walkthroughs to transition from VB to C#. When I try to execute static void Main() { Aplication.Run(new Form1()) } I raise a 'System.NullReferenceException" in system.windows.forms.dll
0
9784
by: muralidharan | last post by:
WebForm1.aspx Code: <%@ Register TagPrefix="ComponentArt" Namespace="ComponentArt.Web.UI" Assembly="ComponentArt.Web.UI" %> <ComponentArt:TreeView id="TreeView1" Height="520" AutoPostBackOnNodeMove="false" DragAndDropEnabled="true" NodeEditingEnabled="False" KeyboardEnabled="true" CssClass="TreeView" NodeCssClass="TreeNode" SelectedNodeCssClass="SelectedTreeNode" HoverNodeCssClass="HoverTreeNode" NodeEditCssClass="NodeEdit"
0
2696
by: Matthias Kwiedor | last post by:
Hi! I want to create a WebBrowser Control at runtime. So i ported the "at start creation" of the Control to a new routine. Everything works fine, but i implement the BeforeNavigateFix and a own Content Menu. For this i need this lines: public void create_new_browser()
2
7857
by: Raed Sawalha | last post by:
i have a windows form(Main) with listview, when click an item in listview i open other window form (Sub) which generate the selected item from parent window in as treeview items when click any item in treeview i display the content item in axWebBrowser, i close the sub form normally when i close the main the following error is generated An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll ...
1
4103
by: msnews.microsoft.com | last post by:
I'm trying to fill an array of objects but when I add the first object I get a NullReferenceException. ---------------------------------------------------------------------------- ------------------------------------------- Public Class TestClass Public NextSubIndex As Integer = 1 Public arrTestSubClass() As TestSubClass
2
2784
by: sxiao | last post by:
Hi, there I got a NullReferenceException when there are more than one users trying to open the same page at the same time. The senerio is: Two users logged into the web application using the Windows domain user account and tried to open the same page which has the databasde query code. When the two user tried to open the same page at the same time, there is a runtime error messsage showing as follows:
6
22231
by: William Mild | last post by:
I must be getting brain fried. I can't see the error. Create a new web form with the following code begind: Public Class test Inherits System.Web.UI.Page Public Class ReportCardData Public Structure Attend Dim DaysTardy As Double
3
3666
by: Alex J. | last post by:
I just started to learn C# (my background is in C++), and right now I study the sockets, TCP/IP etc... so, I found a usefull source code at: http://www.codeguru.com/Csharp/Csharp/cs_network/sockets/article.php/c8781/. But there is a scenarion that throw a strange exception. So, the client is connected to the server, I send a message from client to server and viceversa and than I stop the server from the 'x' button from the right-up corner;...
0
9810
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
10815
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
10524
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10562
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
10236
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
9348
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
5639
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
2
3997
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
3092
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.