Help: BeginInvoke problem

In the form cs:
form()
{
Thisfrm = this;
}
....
....
public delegate void delegateWriteDe tail (string str);
private void WriteDetailScre en(string str)
{
delegateWriteDe tail updateDelegate = new delegateWriteDe tail (WriteDetail );
Thisfrm.BeginIn voke (updateDelegate , new object[] {str});
}

private void WriteDetail (string str)
{
this.txtDetail. Text = str + "\r\n" + this.txtDetail. Text;
}

When I call WriteDetailScre en method that will call BeginInvoke method to let the UI thread update the screen. Something, the WriteDetailScre en method may be called by the same UI thread for the form or called by other threads. When the program is running, the screen is updated properly but I find that I sometime get the error message when call the WriteDetailScre en method. The error is below:
"Invoke or BeginInvoke cannot be called on a control until the window handle has been created"

Why?
How to solve it?

[Jon Skeet [C# MVP]]

<<abc.com>wrote :

In the form cs:
form()
{
Thisfrm = this;
}
...
...
public delegate void delegateWriteDe tail (string str);
private void WriteDetailScre en(string str)
{
delegateWriteDe tail updateDelegate = new delegateWriteDe tail (WriteDetail );
Thisfrm.BeginIn voke (updateDelegate , new object[] {str});
}

private void WriteDetail (string str)
{
this.txtDetail. Text = str + "\r\n" + this.txtDetail. Text;
}

When I call WriteDetailScre en method that will call BeginInvoke
method to let the UI thread update the screen. Something, the
WriteDetailScre en method may be called by the same UI thread for the
form or called by other threads. When the program is running, the
screen is updated properly but I find that I sometime get the error
message when call the WriteDetailScre en method. The error is below:
"Invoke or BeginInvoke cannot be called on a control until the window
handle has been created"

That suggests that something is calling WriteDetailScre en before the
form has first been displayed. It's hard to say for sure without a
short but complete program though.

(Just a tiny point - it's worth following the naming conventions at
http://tinyurl.com/2cun - it'll be easier for others to follow your
code if they can immediately guess if something is a type etc by its
capitalization. )

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too