Problem with Window Form In C#

[SOB7ANALLAH]

I created a form cosists of some controls
when i press the action control button a some sort of loop occur and take
some time to finish (about 3 minutes)

the problem occur when i select another program and comeback to my application,my form showed as white until the process finished

is it any way to refresh !!!

help is very appreciated :-)

[Plater]

Inside your loop, call Application.DoE vents()

[SOB7ANALLAH]

Thank you very much plater
the application work now very well

[IanWright]

Inside your loop, call Application.DoE vents()

Plater, is that a preferred method of solving those problem with GUI updates?

I've not known about that method before and always handled any operations that were going to take a considerable amount of time by firing off another thread, then using delegate to update controls... but that approach looks much easier... I'm just wondering about the benefits/drawbacks of either approach.

I'd normally do something along the following lines, and enable various buttons etc when a progress bar hits 100%. Just used a label here for simplicity...

private void button_click(object sender, EventArgs e)
{
   Thread t = new Thread(new ThreadStart(DoStuff));
   t.Start();
}

private void DoStuff()
{
   int i = 0;
   While(i < 10000000)
   {
     i++;
     UpdateText(i);
   }
}

delegate void UpdateDelegate(int i);
private void UpdateText(int i)
{
   if(label1.InvokeRequired)
   {
      UpdateDelegate ud = new UpdateDelegate(UpdateText);
      this.Invoke(ud, new object[] { i });
   }
   else
   {
      label1.Text = i.ToString();
   }
}

[Plater]

Application.DoE vents() just instructs the program to process any windows messages it has received.
While using threads and delegates is probably the prefered method, it works in smaller situtations where threads would be overkill

[IanWright]

Ok, thanks for that Plater