How to stop long running loop using button

Question

I have c# application which having 2 buttons. First having for loop which is run 10k times. and each loop code execution take 1 second to finish.

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Answer 1

The simplest solution (not best) is to add Application.DoEvents() into the loop to process button events:

private bool cancel;

public void loop()
{
    for(int i=0;i<10000;i++){
      //My running code take 1 sec for each loop
       Application.DoEvents();
       if (cancel)
          break;
    }
}

public void cancelButton_Click(object sender, EventArgs e)
{
      cancel=true;
}

Much better and still simple solution is to employ async Task (the rest of the code stays the same minus Application.DoEvents() call):

private void loopButton_Click(object sender, EventArgs e)
{
    new Task(loop).Start();
}

Beware that you should use this.Invoke(new Action(() => { } )); to access UI controls from the loop in this case.