Datagrid crashes program, when input data is too large

[polarz]

I've written a program that pulls data from the internet and puts it
into a datagrid. When the number of rows reaches a certain point my
program freezes.

Is there a limit to the number of rows you can add? If so, is there a
way to get around this?

Any suggestions are much appreciated. Thanks.

[Miha Markic [MVP C#]]

Hi,

Are you using threading by any chance?

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
miha at rthand com
www.rthand.com

"polarz" <po****@hotmail .com> wrote in message
news:d1******** *************** *********@4ax.c om...

I've written a program that pulls data from the internet and puts it
into a datagrid. When the number of rows reaches a certain point my
program freezes.

Is there a limit to the number of rows you can add? If so, is there a
way to get around this?

Any suggestions are much appreciated. Thanks.

[polarz]

Hi Miha, thanks for the reply. Yes I am using threading. I've tried to
base my code off of this

http://msdn.microsoft.com/library/de...ms06112002.asp

This is my first attempt at using threading so I may be doing
something wrong. Everything seems to work perfect until I get a lot of
data. The most rows I've added is several hundred, I'm not sure of an
exact number. I haven't done anything with the a Cancel button, but
some of that code is left in. My threading code is posted below. Any
suggestions are much appreciated. Thanks
Progress p = new Progress();
p.popData(shown Vals, numArticles);

public class Progress : System.Windows. Forms.Form
{
public Progress()
{}
enum CalcState
{
Pending,
Calculating,
Canceled,
}

Form1 f=(Form1)Update MyWay.Form1.Act iveForm;
CalcState state = CalcState.Pendi ng;

class ShowProgressArg s : EventArgs
{
public string[] progressArr;
public bool Cancel;
public string numArticles;

public ShowProgressArg s(string[] progressArr,
string numArticles)
{
this.numArticle s = numArticles;
this.progressAr r = progressArr;
}

}

delegate void ShowProgressHan dler(object sender, ShowProgressArg s e);

void ShowProgress(ob ject sender, ShowProgressArg s e)
{
// Make sure we're on the right thread
if( this.InvokeRequ ired == false )
{
// Check for Cancel
e.Cancel = (state == CalcState.Cance led);
Convert.ToBoole an(e.progressAr r[0]);
f.textBox1.Text = e.numArticles;
f.textBox1.Upda te();
f.data.Rows.Add (e.progressArr) ;
f.myDataGrid.Up date();

// Check for completion
if( e.Cancel)
{
state = CalcState.Pendi ng;
}
}
// Transfer control to correct thread
else
{
ShowProgressHan dler
showProgress = new ShowProgressHan dler(ShowProgre ss);
Invoke(showProg ress, new object[] { sender, e});
}
}

public void popData(string[] sData, string nArticles)
{
object sender = System.Threadin g.Thread.Curren tThread;
ShowProgressArg s e = new ShowProgressArg s(sData, nArticles);

// Show progress (ignoring Cancel so soon)
ShowProgress(se nder, e);
}
}

//Thanks Miha ;)
On Sun, 22 Feb 2004 11:31:09 +0100, "Miha Markic [MVP C#]" <miha at
rthand com> wrote:

Hi,

Are you using threading by any chance?

[fbhcah]

Hi,

There is virtually no limit to the amount of data that can be shown by the datagrid - it's only limited by the amount of memory the client system has. So your issue might be something else...

Regards,
fbhcah

[Miha Markic [MVP C#]]

Hi,

The code seems ok at the first glance.
Do you touch (in worker thread) sData after you assign it to grid?

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
miha at rthand com
www.rthand.com

"polarz" <po****@hotmail .com> wrote in message
news:sc******** *************** *********@4ax.c om...

Hi Miha, thanks for the reply. Yes I am using threading. I've tried to
base my code off of this

http://msdn.microsoft.com/library/de...ms06112002.asp
This is my first attempt at using threading so I may be doing
something wrong. Everything seems to work perfect until I get a lot of
data. The most rows I've added is several hundred, I'm not sure of an
exact number. I haven't done anything with the a Cancel button, but
some of that code is left in. My threading code is posted below. Any
suggestions are much appreciated. Thanks
Progress p = new Progress();
p.popData(shown Vals, numArticles);

public class Progress : System.Windows. Forms.Form
{
public Progress()
{}
enum CalcState
{
Pending,
Calculating,
Canceled,
}

Form1 f=(Form1)Update MyWay.Form1.Act iveForm;
CalcState state = CalcState.Pendi ng;

class ShowProgressArg s : EventArgs
{
public string[] progressArr;
public bool Cancel;
public string numArticles;

public ShowProgressArg s(string[] progressArr,
string numArticles)
{
this.numArticle s = numArticles;
this.progressAr r = progressArr;
}

}

delegate void ShowProgressHan dler(object sender, ShowProgressArg s e);

void ShowProgress(ob ject sender, ShowProgressArg s e)
{
// Make sure we're on the right thread
if( this.InvokeRequ ired == false )
{
// Check for Cancel
e.Cancel = (state == CalcState.Cance led);
Convert.ToBoole an(e.progressAr r[0]);
f.textBox1.Text = e.numArticles;
f.textBox1.Upda te();
f.data.Rows.Add (e.progressArr) ;
f.myDataGrid.Up date();

// Check for completion
if( e.Cancel)
{
state = CalcState.Pendi ng;
}
}
// Transfer control to correct thread
else
{
ShowProgressHan dler
showProgress = new ShowProgressHan dler(ShowProgre ss);
Invoke(showProg ress, new object[] { sender, e});
}
}

public void popData(string[] sData, string nArticles)
{
object sender = System.Threadin g.Thread.Curren tThread;
ShowProgressArg s e = new ShowProgressArg s(sData, nArticles);

// Show progress (ignoring Cancel so soon)
ShowProgress(se nder, e);
}
}

//Thanks Miha ;)
On Sun, 22 Feb 2004 11:31:09 +0100, "Miha Markic [MVP C#]" <miha at
rthand com> wrote:

Hi,

Are you using threading by any chance?