How to block double click in overridden WndProc function in Windows Forms?

Question

I have a form created in Windows Forms which is draggable wherever I click. I made it by overriding WndProc function which in turn modifies each click as it was a title bar

Answer 1

If you just want to stop the double click from having it's default behavior in the window for which you've overridden the WndProc then intercept the WM_LBUTTONDBLCLK message

private const int WM_LBUTTONDBLCLK = 0x0203;

...

protected override void WndProc(ref Message message) {
  if (message.Msg == WM_LBUTTONDBLCLK) {
    return;
  }

  base.WndProc(ref message);

  if (message.Msg == WM_NCHITTEST && (int)message.Result == HTCLIENT)
    message.Result = (IntPtr)HTCAPTION;
}