C# .NET: Ignoring Alt-F4 key combination

Alt-F4 is a shortcut that closes a window. For some reason you may not be fond of this behavior. After doing some digging around, I finally found a good method of ignoring this request - overriding the ProcessDialogKey method. You can go do more research if you'd like, but the basic code is as follows:

protected override bool ProcessDialogKey(Keys keyData)
{
   if (keyData == (Keys.Alt | Keys.F4))
      return true;
   else
      return base.ProcessDialogKey(keyData);
}