ExecutionEngine Exception -> Code sample that triggers EEE

[TT (Tom Tempelaere)]

Hi people,

The code that follows throws an ExecutionEngine Exception. This was written
in C# (Microsoft Visual C# .NET 69462-335-0000007-18823) using MSDE 7.1
(7.1.3088). The framework is .NET 1.1 (1.1.4322). I tested the program on a
Windows XP Professional/SP1, with a Pentium 4/2.6Ghz processor, with 2Gb RAM.
The code is a single form that when run throws an ExecutionEngine Exception in
'AddRowsToTable '.

If someone with more knowledge on this matter could help me out, or point it
out to MS.NET developers I'd be grateful. If more information is needed I
will be glad to supply it. Here goes:

using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;

namespace Test_EEE_bug
{
public class Form1 : System.Windows. Forms.Form
{
private DataTable dtSource = new DataTable( "Entries" );
private ArrayList logQueue = null;
private System.Timers.T imer logTimer = null;
private readonly object logLock = new object( );
private System.Threadin g.Thread workerThread = null;
private int counter = 0;

private System.Windows. Forms.DataGrid dataGrid1;
private System.Windows. Forms.DataGridT ableStyle dataGridTableSt yle1;
private System.Windows. Forms.DataGridT extBoxColumn dataGridTextBox Column1;
private System.Componen tModel.Containe r components = null;

private delegate void SimpleHandler( );
private delegate void AddRowsToTableH andler( DataRow[] drs );

public Form1()
{
InitializeCompo nent();

DataColumn dtColumn = new DataColumn( "Text", typeof(string) );
dtColumn.ReadOn ly = true;
dtSource.Column s.Add( dtColumn );
dataGrid1.SetDa taBinding( dtSource, null );

logQueue = new ArrayList( );

logTimer = new System.Timers.T imer( );
logTimer.AutoRe set = false;
logTimer.Interv al = 250;
logTimer.Synchr onizingObject = null;
logTimer.Elapse d += new
System.Timers.E lapsedEventHand ler(logTimer_El apsed);
logTimer.Enable d = true;
}

private void OnLoad(object sender, System.EventArg s e)
{
SpawnThread( );
}

private void SpawnThread()
{
workerThread = new System.Threadin g.Thread( new
System.Threadin g.ThreadStart( WorkingThread ) );
workerThread.St art( );
}

private void WorkingThread( )
{
try
{
for( int i = 0; i != 8; ++i )
Write( "Log line " + ++counter );
}
finally
{
this.BeginInvok e( new SimpleHandler( SpawnThread ) );
}
}

public void Write( string text )
{
lock( logLock )
logQueue.Add( text );
}

private void logTimer_Elapse d(object sender,
System.Timers.E lapsedEventArgs e)
{
ArrayList writeOutQueue = null;
lock( logLock )
if( logQueue.Count != 0 )
{
writeOutQueue = logQueue;
logQueue = new ArrayList( );
}

if( writeOutQueue == null )
logTimer.Enable d = true;
else
{
ArrayList dataRows = new ArrayList( );

for( int i = 0; i != writeOutQueue.C ount; ++i )
{
DataRow dr1 = dtSource.NewRow ( );
dr1[ "Text" ] = writeOutQueue[ i ];
dataRows.Add( dr1 );
}

BeginInvoke( new AddRowsToTableH andler( AddRowsToTable ), new object[]{
(DataRow[]) dataRows.ToArra y( typeof(DataRow) ) } );
}
}

private void AddRowsToTable( DataRow[] drs )
{
dataGrid1.Suspe ndLayout( );
dtSource.BeginL oadData( );

foreach( DataRow dr in drs )
dtSource.Rows.A dd( dr );

dtSource.EndLoa dData( );
dataGrid1.Resum eLayout( );

logTimer.Enable d = true;
}

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
private void InitializeCompo nent()
{
this.dataGrid1 = new System.Windows. Forms.DataGrid( );
this.dataGridTa bleStyle1 = new System.Windows. Forms.DataGridT ableStyle();
this.dataGridTe xtBoxColumn1 = new
System.Windows. Forms.DataGridT extBoxColumn();
((System.Compon entModel.ISuppo rtInitialize)(t his.dataGrid1)) .BeginInit();
this.SuspendLay out();
//
// dataGrid1
//
this.dataGrid1. DataMember = "";
this.dataGrid1. HeaderForeColor = System.Drawing. SystemColors.Co ntrolText;
this.dataGrid1. Location = new System.Drawing. Point(8, 8);
this.dataGrid1. Name = "dataGrid1" ;
this.dataGrid1. ReadOnly = true;
this.dataGrid1. Size = new System.Drawing. Size(592, 440);
this.dataGrid1. TabIndex = 0;
this.dataGrid1. TableStyles.Add Range(new
System.Windows. Forms.DataGridT ableStyle[] {
this.dataGridTa bleStyle1});
//
// dataGridTableSt yle1
//
this.dataGridTa bleStyle1.DataG rid = this.dataGrid1;
this.dataGridTa bleStyle1.GridC olumnStyles.Add Range(new
System.Windows. Forms.DataGridC olumnStyle[] {

this.dataGridTe xtBoxColumn1});
this.dataGridTa bleStyle1.Heade rForeColor =
System.Drawing. SystemColors.Co ntrolText;
this.dataGridTa bleStyle1.Mappi ngName = "";
this.dataGridTa bleStyle1.ReadO nly = true;
//
// dataGridTextBox Column1
//
this.dataGridTe xtBoxColumn1.Fo rmat = "";
this.dataGridTe xtBoxColumn1.Fo rmatInfo = null;
this.dataGridTe xtBoxColumn1.He aderText = "Text";
this.dataGridTe xtBoxColumn1.Ma ppingName = "Text";
this.dataGridTe xtBoxColumn1.Re adOnly = true;
this.dataGridTe xtBoxColumn1.Wi dth = 75;
//
// Form1
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(608, 453);
this.Controls.A dd(this.dataGri d1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHan dler(this.OnLoa d);
((System.Compon entModel.ISuppo rtInitialize)(t his.dataGrid1)) .EndInit();
this.ResumeLayo ut(false);
}
#endregion

[STAThread]
static void Main()
{
Application.Run (new Form1());
}
}
}

Kind regards,
--
Tom Tempelaere.

[Willy Denoyette [MVP]]

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:Om******** *****@TK2MSFTNG P12.phx.gbl...

It ran fine for me but I'm running a productionn machine with .NET 1.1 on
board. All my 2.0 setups are on VM's

--
Bob Powell [MVP]

Do you mean you could smoothly scroll the grid? What I noticed is that the
program creates +32000 threads per second using v2.0 and +36000 on v1.1,
when run on a real fast system. This extreme high thread spawning rate
renders the UI non responsive on a fast sytem (I've seen it's handle count
going higher than 27000), on slow system the UI is more or less responsive
(well sort of). Anyway this program is a CPU hog.

Willy.

[TT \(Tom Tempelaere\)]

Willy, Bob,

I didn't know it could create and destroy that much threads per second. It's
worth noting :).

Thanks for the input.
Tom.

"Willy Denoyette [MVP]" <wi************ *@telenet.be> schreef in bericht
news:eQ******** *****@TK2MSFTNG P11.phx.gbl...

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:Om******** *****@TK2MSFTNG P12.phx.gbl...

It ran fine for me but I'm running a productionn machine with .NET 1.1 on
board. All my 2.0 setups are on VM's

--
Bob Powell [MVP]

Do you mean you could smoothly scroll the grid? What I noticed is that the
program creates +32000 threads per second using v2.0 and +36000 on v1.1,
when run on a real fast system. This extreme high thread spawning rate
renders the UI non responsive on a fast sytem (I've seen it's handle count
going higher than 27000), on slow system the UI is more or less responsive
(well sort of). Anyway this program is a CPU hog.

Willy.

[Willy Denoyette [MVP]]

Note that the figures I gave in a previous post were wrong, these are the
number of messages written to the grid per second, the number of threads per
second are ~4000 and ~4500.

Actually, you don't destroy the threads, the thread procedure is just a
simple loop calling 8 times Write() followed by a call to BeginInvoke, when
this call returns the thread procedure exits and the thread terminates, now
the BeginInvoke call results in the creation of a new thread that runs the
same procedure again. That means that your thread creations are serialized
by the message loop, so you'll never have more than one such thread running.
Anyway, you are burning a lot of cycles just to write 8 messages to a grid,
the overhead of the thread creation is enormous, and again it deadlocks on a
SMP box, but I can't see why honestly.

Willy.

"TT (Tom Tempelaere)" </\/_0_$P@/\/\titi____AThotm ailD.Tcom/\/\@P$_0_/\/>
wrote in message news:JY******** **********@phob os.telenet-ops.be...

Willy, Bob,

I didn't know it could create and destroy that much threads per second.
It's worth noting :).

Thanks for the input.
Tom.

"Willy Denoyette [MVP]" <wi************ *@telenet.be> schreef in bericht
news:eQ******** *****@TK2MSFTNG P11.phx.gbl...

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:Om******** *****@TK2MSFTNG P12.phx.gbl...

It ran fine for me but I'm running a productionn machine with .NET 1.1
on board. All my 2.0 setups are on VM's

--
Bob Powell [MVP]

Do you mean you could smoothly scroll the grid? What I noticed is that
the program creates +32000 threads per second using v2.0 and +36000 on
v1.1, when run on a real fast system. This extreme high thread spawning
rate renders the UI non responsive on a fast sytem (I've seen it's handle
count going higher than 27000), on slow system the UI is more or less
responsive (well sort of). Anyway this program is a CPU hog.

Willy.

[TT (Tom Tempelaere)]

Hi again,

Bad news. The installation of SP1 seems to introduce other problems leading
to ExecutionEngine Exception's again! The problems occur less than before
(only once/twice a day for continuously running process) but is a MAJOR
obstruction to our project. I cannot express how I feel about this (at least
_very_ negative) because both .NET 1.1 and .NET 1.1/SP1 give problems with
our code.

I don't really know what to do with the problem, except cutting the
functionality from the project.

Kind regards,
--
Tom Tempelaere.
"TT (Tom Tempelaere)" wrote:

Hi Bob,

Good news, I downloaded and installed .NET 1.1/SP1 and it solved the
problem. Honestly I was not aware that there was a SP1 for .NET 1.1. I find
it weird that the version number did not increase. I wonder, is SP1 for .NET
1.1 automatically installed with XP/SP2?

Kind regards,
--
Tom Tempelaere.
"Bob Powell [MVP]" wrote:

Ahh, Hi, I saw this after I posted the other reply. Let me know how your
results go. If this is old news we shouldn't worry too much.

Bob.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"TT (Tom Tempelaere)" <_|\|_0$P@|/\|titi____AThot mailD.Tcom|/\|@P$0_|\|_>
wrote in message news:F5******** *************** ***********@mic rosoft.com...

Hi Bob,

After experimenting on other PC's we noticed that on one PC the exception
didn't trigger. We compared them, and noticed that one was running XP/SP2
with .NET 1.1/SP1. I'm going to upgrade the .NET framework and see if this
still occurs, but it looks like it got solved already. I'll test this
further
and post my findings...

Thanks & kind regards,
--
Tom Tempelaere.
"Bob Powell [MVP]" wrote:

> I'll make sure someone sees this.
> Thanks.
>
> --
> Bob Powell [MVP]
> Visual C#, System.Drawing
>
> Ramuseco Limited .NET consulting
> http://www.ramuseco.com
>
> Find great Windows Forms articles in Windows Forms Tips and Tricks
> http://www.bobpowell.net/tipstricks.htm
>
> Answer those GDI+ questions with the GDI+ FAQ
> http://www.bobpowell.net/faqmain.htm
>
> All new articles provide code in C# and VB.NET.
> Subscribe to the RSS feeds provided and never miss a new article.
>
>
>
>
>
> "TT (Tom Tempelaere)" <_|\|_0$P@|/\|titi____AThot mailD.Tcom|/\|@P$0_|\|_>
> wrote in message
> news:81******** *************** ***********@mic rosoft.com...
> > Hi people,
> >
> > The code that follows throws an ExecutionEngine Exception. This was
> > written
> > in C# (Microsoft Visual C# .NET 69462-335-0000007-18823) using MSDE
> > 7.1
> > (7.1.3088). The framework is .NET 1.1 (1.1.4322). I tested the program
> > on
> > a
> > Windows XP Professional/SP1, with a Pentium 4/2.6Ghz processor, with
> > 2Gb
> > RAM.
> > The code is a single form that when run throws an
> > ExecutionEngine Exception
> > in
> > 'AddRowsToTable '.
> >
> > If someone with more knowledge on this matter could help me out, or
> > point
> > it
> > out to MS.NET developers I'd be grateful. If more information is needed
> > I
> > will be glad to supply it. Here goes:
> >
> > using System;
> > using System.Drawing;
> > using System.Collecti ons;
> > using System.Componen tModel;
> > using System.Windows. Forms;
> > using System.Data;
> >
> > namespace Test_EEE_bug
> > {
> > public class Form1 : System.Windows. Forms.Form
> > {
> > private DataTable dtSource = new DataTable( "Entries" );
> > private ArrayList logQueue = null;
> > private System.Timers.T imer logTimer = null;
> > private readonly object logLock = new object( );
> > private System.Threadin g.Thread workerThread = null;
> > private int counter = 0;
> >
> > private System.Windows. Forms.DataGrid dataGrid1;
> > private System.Windows. Forms.DataGridT ableStyle dataGridTableSt yle1;
> > private System.Windows. Forms.DataGridT extBoxColumn
> > dataGridTextBox Column1;
> > private System.Componen tModel.Containe r components = null;
> >
> > private delegate void SimpleHandler( );
> > private delegate void AddRowsToTableH andler( DataRow[] drs );
> >
> > public Form1()
> > {
> > InitializeCompo nent();
> >
> > DataColumn dtColumn = new DataColumn( "Text", typeof(string) );
> > dtColumn.ReadOn ly = true;
> > dtSource.Column s.Add( dtColumn );
> > dataGrid1.SetDa taBinding( dtSource, null );
> >
> > logQueue = new ArrayList( );
> >
> > logTimer = new System.Timers.T imer( );
> > logTimer.AutoRe set = false;
> > logTimer.Interv al = 250;
> > logTimer.Synchr onizingObject = null;
> > logTimer.Elapse d += new
> > System.Timers.E lapsedEventHand ler(logTimer_El apsed);
> > logTimer.Enable d = true;
> > }
> >
> > private void OnLoad(object sender, System.EventArg s e)
> > {
> > SpawnThread( );
> > }
> >
> > private void SpawnThread()
> > {
> > workerThread = new System.Threadin g.Thread( new
> > System.Threadin g.ThreadStart( WorkingThread ) );
> > workerThread.St art( );
> > }
> >
> > private void WorkingThread( )
> > {
> > try
> > {
> > for( int i = 0; i != 8; ++i )
> > Write( "Log line " + ++counter );
> > }
> > finally
> > {
> > this.BeginInvok e( new SimpleHandler( SpawnThread ) );
> > }
> > }
> >
> > public void Write( string text )
> > {
> > lock( logLock )
> > logQueue.Add( text );
> > }
> >
> > private void logTimer_Elapse d(object sender,
> > System.Timers.E lapsedEventArgs e)
> > {
> > ArrayList writeOutQueue = null;
> > lock( logLock )
> > if( logQueue.Count != 0 )
> > {
> > writeOutQueue = logQueue;
> > logQueue = new ArrayList( );
> > }
> >
> > if( writeOutQueue == null )
> > logTimer.Enable d = true;
> > else
> > {
> > ArrayList dataRows = new ArrayList( );
> >
> > for( int i = 0; i != writeOutQueue.C ount; ++i )
> > {
> > DataRow dr1 = dtSource.NewRow ( );
> > dr1[ "Text" ] = writeOutQueue[ i ];
> > dataRows.Add( dr1 );
> > }
> >
> > BeginInvoke( new AddRowsToTableH andler( AddRowsToTable ), new
> > object[]{
> > (DataRow[]) dataRows.ToArra y( typeof(DataRow) ) } );
> > }
> > }
> >
> > private void AddRowsToTable( DataRow[] drs )
> > {
> > dataGrid1.Suspe ndLayout( );
> > dtSource.BeginL oadData( );
> >
> > foreach( DataRow dr in drs )
> > dtSource.Rows.A dd( dr );
> >
> > dtSource.EndLoa dData( );
> > dataGrid1.Resum eLayout( );
> >
> > logTimer.Enable d = true;
> > }
> >
> > protected override void Dispose( bool disposing )
> > {
> > if( disposing )
> > {
> > if (components != null)
> > {
> > components.Disp ose();
> > }
> > }
> > base.Dispose( disposing );
> > }
> >
> > #region Windows Form Designer generated code
> > private void InitializeCompo nent()
> > {
> > this.dataGrid1 = new System.Windows. Forms.DataGrid( );
> > this.dataGridTa bleStyle1 = new
> > System.Windows. Forms.DataGridT ableStyle();
> > this.dataGridTe xtBoxColumn1 = new
> > System.Windows. Forms.DataGridT extBoxColumn();
> >
> > ((System.Compon entModel.ISuppo rtInitialize)(t his.dataGrid1)) .BeginInit();
> > this.SuspendLay out();
> > //
> > // dataGrid1
> > //
> > this.dataGrid1. DataMember = "";
> > this.dataGrid1. HeaderForeColor =
> > System.Drawing. SystemColors.Co ntrolText;
> > this.dataGrid1. Location = new System.Drawing. Point(8, 8);
> > this.dataGrid1. Name = "dataGrid1" ;
> > this.dataGrid1. ReadOnly = true;
> > this.dataGrid1. Size = new System.Drawing. Size(592, 440);
> > this.dataGrid1. TabIndex = 0;
> > this.dataGrid1. TableStyles.Add Range(new
> > System.Windows. Forms.DataGridT ableStyle[] {
> > this.dataGridTa bleStyle1});
> > //
> > // dataGridTableSt yle1
> > //
> > this.dataGridTa bleStyle1.DataG rid = this.dataGrid1;
> > this.dataGridTa bleStyle1.GridC olumnStyles.Add Range(new
> > System.Windows. Forms.DataGridC olumnStyle[] {
> >
> > this.dataGridTe xtBoxColumn1});
> > this.dataGridTa bleStyle1.Heade rForeColor =
> > System.Drawing. SystemColors.Co ntrolText;
> > this.dataGridTa bleStyle1.Mappi ngName = "";
> > this.dataGridTa bleStyle1.ReadO nly = true;
> > //
> > // dataGridTextBox Column1
> > //
> > this.dataGridTe xtBoxColumn1.Fo rmat = "";
> > this.dataGridTe xtBoxColumn1.Fo rmatInfo = null;
> > this.dataGridTe xtBoxColumn1.He aderText = "Text";
> > this.dataGridTe xtBoxColumn1.Ma ppingName = "Text";
> > this.dataGridTe xtBoxColumn1.Re adOnly = true;
> > this.dataGridTe xtBoxColumn1.Wi dth = 75;
> > //
> > // Form1
> > //
> > this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
> > this.ClientSize = new System.Drawing. Size(608, 453);
> > this.Controls.A dd(this.dataGri d1);
> > this.Name = "Form1";
> > this.Text = "Form1";
> > this.Load += new System.EventHan dler(this.OnLoa d);
> >
> > ((System.Compon entModel.ISuppo rtInitialize)(t his.dataGrid1)) .EndInit();
> > this.ResumeLayo ut(false);
> > }

[TT (Tom Tempelaere)]

Hi,

Once more I'm falling for the obvious trap, being, I'm posting problems I
have _way _ too fast. Misinformation led me to believe that SP1 was already
installed on the target machine, which was not the case (people who
installed, told me they had:'( ).

I apologize to this group, and to MS, for being so stupid and for not
verifying before posting. I shall try to be more clever in the future.

Kind regards,
--
Tom Tempelaere.
"TT (Tom Tempelaere)" wrote:

Hi again,

Bad news. The installation of SP1 seems to introduce other problems leading
to ExecutionEngine Exception's again! The problems occur less than before
(only once/twice a day for continuously running process) but is a MAJOR
obstruction to our project. I cannot express how I feel about this (at least
_very_ negative) because both .NET 1.1 and .NET 1.1/SP1 give problems with
our code.

I don't really know what to do with the problem, except cutting the
functionality from the project.

Kind regards,
--
Tom Tempelaere.
"TT (Tom Tempelaere)" wrote:

Hi Bob,

Good news, I downloaded and installed .NET 1.1/SP1 and it solved the
problem. Honestly I was not aware that there was a SP1 for .NET 1.1. I find
it weird that the version number did not increase. I wonder, is SP1 for .NET
1.1 automatically installed with XP/SP2?

Kind regards,
--
Tom Tempelaere.
"Bob Powell [MVP]" wrote:

Ahh, Hi, I saw this after I posted the other reply. Let me know how your
results go. If this is old news we shouldn't worry too much.

Bob.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"TT (Tom Tempelaere)" <_|\|_0$P@|/\|titi____AThot mailD.Tcom|/\|@P$0_|\|_>
wrote in message news:F5******** *************** ***********@mic rosoft.com...
> Hi Bob,
>
> After experimenting on other PC's we noticed that on one PC the exception
> didn't trigger. We compared them, and noticed that one was running XP/SP2
> with .NET 1.1/SP1. I'm going to upgrade the .NET framework and see if this
> still occurs, but it looks like it got solved already. I'll test this
> further
> and post my findings...
>
> Thanks & kind regards,
> --
> Tom Tempelaere.
>
>
> "Bob Powell [MVP]" wrote:
>
>> I'll make sure someone sees this.
>> Thanks.
>>
>> --
>> Bob Powell [MVP]
>> Visual C#, System.Drawing
>>
>> Ramuseco Limited .NET consulting
>> http://www.ramuseco.com
>>
>> Find great Windows Forms articles in Windows Forms Tips and Tricks
>> http://www.bobpowell.net/tipstricks.htm
>>
>> Answer those GDI+ questions with the GDI+ FAQ
>> http://www.bobpowell.net/faqmain.htm
>>
>> All new articles provide code in C# and VB.NET.
>> Subscribe to the RSS feeds provided and never miss a new article.
>>
>>
>>
>>
>>
>> "TT (Tom Tempelaere)" <_|\|_0$P@|/\|titi____AThot mailD.Tcom|/\|@P$0_|\|_>
>> wrote in message
>> news:81******** *************** ***********@mic rosoft.com...
>> > Hi people,
>> >
>> > The code that follows throws an ExecutionEngine Exception. This was
>> > written
>> > in C# (Microsoft Visual C# .NET 69462-335-0000007-18823) using MSDE
>> > 7.1
>> > (7.1.3088). The framework is .NET 1.1 (1.1.4322). I tested the program
>> > on
>> > a
>> > Windows XP Professional/SP1, with a Pentium 4/2.6Ghz processor, with
>> > 2Gb
>> > RAM.
>> > The code is a single form that when run throws an
>> > ExecutionEngine Exception
>> > in
>> > 'AddRowsToTable '.
>> >
>> > If someone with more knowledge on this matter could help me out, or
>> > point
>> > it
>> > out to MS.NET developers I'd be grateful. If more information is needed
>> > I
>> > will be glad to supply it. Here goes:
>> >
>> > using System;
>> > using System.Drawing;
>> > using System.Collecti ons;
>> > using System.Componen tModel;
>> > using System.Windows. Forms;
>> > using System.Data;
>> >
>> > namespace Test_EEE_bug
>> > {
>> > public class Form1 : System.Windows. Forms.Form
>> > {
>> > private DataTable dtSource = new DataTable( "Entries" );
>> > private ArrayList logQueue = null;
>> > private System.Timers.T imer logTimer = null;
>> > private readonly object logLock = new object( );
>> > private System.Threadin g.Thread workerThread = null;
>> > private int counter = 0;
>> >
>> > private System.Windows. Forms.DataGrid dataGrid1;
>> > private System.Windows. Forms.DataGridT ableStyle dataGridTableSt yle1;
>> > private System.Windows. Forms.DataGridT extBoxColumn
>> > dataGridTextBox Column1;
>> > private System.Componen tModel.Containe r components = null;
>> >
>> > private delegate void SimpleHandler( );
>> > private delegate void AddRowsToTableH andler( DataRow[] drs );
>> >
>> > public Form1()
>> > {
>> > InitializeCompo nent();
>> >
>> > DataColumn dtColumn = new DataColumn( "Text", typeof(string) );
>> > dtColumn.ReadOn ly = true;
>> > dtSource.Column s.Add( dtColumn );
>> > dataGrid1.SetDa taBinding( dtSource, null );
>> >
>> > logQueue = new ArrayList( );
>> >
>> > logTimer = new System.Timers.T imer( );
>> > logTimer.AutoRe set = false;
>> > logTimer.Interv al = 250;
>> > logTimer.Synchr onizingObject = null;
>> > logTimer.Elapse d += new
>> > System.Timers.E lapsedEventHand ler(logTimer_El apsed);
>> > logTimer.Enable d = true;
>> > }
>> >
>> > private void OnLoad(object sender, System.EventArg s e)
>> > {
>> > SpawnThread( );
>> > }
>> >
>> > private void SpawnThread()
>> > {
>> > workerThread = new System.Threadin g.Thread( new
>> > System.Threadin g.ThreadStart( WorkingThread ) );
>> > workerThread.St art( );
>> > }
>> >
>> > private void WorkingThread( )
>> > {
>> > try
>> > {
>> > for( int i = 0; i != 8; ++i )
>> > Write( "Log line " + ++counter );
>> > }
>> > finally
>> > {
>> > this.BeginInvok e( new SimpleHandler( SpawnThread ) );
>> > }
>> > }
>> >
>> > public void Write( string text )
>> > {
>> > lock( logLock )
>> > logQueue.Add( text );
>> > }
>> >
>> > private void logTimer_Elapse d(object sender,
>> > System.Timers.E lapsedEventArgs e)
>> > {
>> > ArrayList writeOutQueue = null;
>> > lock( logLock )
>> > if( logQueue.Count != 0 )
>> > {
>> > writeOutQueue = logQueue;
>> > logQueue = new ArrayList( );
>> > }
>> >
>> > if( writeOutQueue == null )
>> > logTimer.Enable d = true;
>> > else
>> > {
>> > ArrayList dataRows = new ArrayList( );
>> >
>> > for( int i = 0; i != writeOutQueue.C ount; ++i )
>> > {
>> > DataRow dr1 = dtSource.NewRow ( );
>> > dr1[ "Text" ] = writeOutQueue[ i ];
>> > dataRows.Add( dr1 );
>> > }
>> >
>> > BeginInvoke( new AddRowsToTableH andler( AddRowsToTable ), new
>> > object[]{
>> > (DataRow[]) dataRows.ToArra y( typeof(DataRow) ) } );
>> > }
>> > }
>> >
>> > private void AddRowsToTable( DataRow[] drs )
>> > {
>> > dataGrid1.Suspe ndLayout( );
>> > dtSource.BeginL oadData( );
>> >
>> > foreach( DataRow dr in drs )
>> > dtSource.Rows.A dd( dr );
>> >
>> > dtSource.EndLoa dData( );
>> > dataGrid1.Resum eLayout( );
>> >
>> > logTimer.Enable d = true;
>> > }
>> >
>> > protected override void Dispose( bool disposing )
>> > {
>> > if( disposing )
>> > {
>> > if (components != null)
>> > {
>> > components.Disp ose();
>> > }
>> > }
>> > base.Dispose( disposing );
>> > }
>> >
>> > #region Windows Form Designer generated code
>> > private void InitializeCompo nent()
>> > {
>> > this.dataGrid1 = new System.Windows. Forms.DataGrid( );
>> > this.dataGridTa bleStyle1 = new
>> > System.Windows. Forms.DataGridT ableStyle();
>> > this.dataGridTe xtBoxColumn1 = new
>> > System.Windows. Forms.DataGridT extBoxColumn();
>> >
>> > ((System.Compon entModel.ISuppo rtInitialize)(t his.dataGrid1)) .BeginInit();
>> > this.SuspendLay out();
>> > //
>> > // dataGrid1
>> > //
>> > this.dataGrid1. DataMember = "";
>> > this.dataGrid1. HeaderForeColor =
>> > System.Drawing. SystemColors.Co ntrolText;
>> > this.dataGrid1. Location = new System.Drawing. Point(8, 8);
>> > this.dataGrid1. Name = "dataGrid1" ;
>> > this.dataGrid1. ReadOnly = true;
>> > this.dataGrid1. Size = new System.Drawing. Size(592, 440);
>> > this.dataGrid1. TabIndex = 0;
>> > this.dataGrid1. TableStyles.Add Range(new
>> > System.Windows. Forms.DataGridT ableStyle[] {
>> > this.dataGridTa bleStyle1});
>> > //
>> > // dataGridTableSt yle1
>> > //
>> > this.dataGridTa bleStyle1.DataG rid = this.dataGrid1;
>> > this.dataGridTa bleStyle1.GridC olumnStyles.Add Range(new
>> > System.Windows. Forms.DataGridC olumnStyle[] {
>> >
>> > this.dataGridTe xtBoxColumn1});
>> > this.dataGridTa bleStyle1.Heade rForeColor =
>> > System.Drawing. SystemColors.Co ntrolText;
>> > this.dataGridTa bleStyle1.Mappi ngName = "";
>> > this.dataGridTa bleStyle1.ReadO nly = true;
>> > //
>> > // dataGridTextBox Column1
>> > //