[alonalon]

How can my background worker effect my WindowsForm control?

I have a WindowsForm and a background worker, I give the background worker a task and in the end of it needs to change a text of a control in my WindowsForm(I'v set the control to "public").

I get this error:
"Cross-thread operation not valid: Control 'Name1' accessed from a thread other than the thread it was created on."

[Silicon]

You can't edit Forms controls from any other thread. Make a variable with the value you need to change, then use a Timer to update it every so often. That's the easiest way to do it. Otherwise you're messing around with threading a lot.

[iVision]

With backgroundworker you can put in Form_load:
checkforilligalcrossscripting = false; (something like that)
And with threading:
invoke((methodinvoker(delegate { change w/e here ; }));

[alonalon]

With backgroundworker you can put in Form_load:
checkforilligalcrossscripting = false; (something like that)
And with threading:
invoke((methodinvoker(delegate { change w/e here ; }));

Sorry for not being able to understand what you wrote, I usually need a well explained explanation to understand something wrote in English.
Thanks for helping anyway.

You can't edit Forms controls from any other thread. Make a variable with the value you need to change, then use a Timer to update it every so often. That's the easiest way to do it. Otherwise you're messing around with threading a lot.

Can you give me a simple example code please?

[iVision]

Sorry for not being able to understand what you wrote, I usually need a well explained explanation to understand something wrote in English.
Thanks for helping anyway.

Can you give me a simple example code please?

I gave a working code?

Code

invoke((methodinvoker(delegate { yourwhateveryouneedtochangeonyourformhereplease; }));

That will work for multithreading.
so do this:

Code

using System.Threading;

Void changeTextbox()
{
invoke((methodinvoker(delegate { textBox1.Text = "Changed out of a thread."; }));
}

void Form1_Load....
{
Thread ctextBox = new Thread(changeTextBox);
ctextBox.Start();

}

[alonalon]

I gave a working code?

Code

invoke((methodinvoker(delegate { yourwhateveryouneedtochangeonyourformhereplease; }));

That will work for multithreading.
so do this:

Code

using System.Threading;

Void changeTextbox()
{
invoke((methodinvoker(delegate { textBox1.Text = "Changed out of a thread."; }));
}

void Form1_Load....
{
Thread ctextBox = new Thread(changeTextBox);
ctextBox.Start();

}

I tells me "The name 'invoke' does not exist in the current context"

and

"I tells me "The name 'methodinvoker' does not exist in the current context""

[DragQueen]

this will run in main thread.
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);

this will run in diffrent thread
worker.DoWork += new DoWorkEventHandler(worker_DoWork);

So change what you want in main thread
only in RunWorkerCompleted & ProgressChanged