❔ App Freezed Even Added Threads.Sleep in Loop

while (this.run)
{
    if (!this.run)
    {
        break;
    }
    Win32.POINT p = new Win32.POINT();
    Win32.ClientToScreen(IntPtr.Zero, ref p);
    Win32.mouse_event(Win32.MOUSEEVENTF_LEFTDOWN | Win32.MOUSEEVENTF_LEFTUP, (uint)p.x, (uint)p.y, 0, 0);
    Thread.Sleep(1000);
    
}