Why isn't the mouse clicking when I am telling it to?
===

I am using the following code from http://stackoverflow.com/questions/2416748/how-to-simulate-mouse-click-in-c and I have found that it does not work. Here is the code:

        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]

        public static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint cButtons, uint dwExtraInfo);

        private const int MOUSEEVENTF_LEFTDOWN = 0x02;
        private const int MOUSEEVENTF_LEFTUP = 0x04;
        private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
        private const int MOUSEEVENTF_RIGHTUP = 0x10;

        public void DoMouseClick()
        {
            mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 882, 554, 0, 0);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DoMouseClick();
        }

I have also tried replacing `mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENT_LEFTUP...` with `mouse_event(MOUSEEVENTF_LEFTDOWN & MOUSEEVENT_LEFTUP...` but still no luck. Other people have had success with this... Why am I not?