static public long au3_PixelChecksum(int x1, int y1, int x2, int y2)
{
long myvalue = 0;
AutoItX3 au3 = new AutoItX3();
myvalue = (long)au3.PixelChecksum(Xx + x1, Yy + y1, Xx + x2, Yy + y2);
Thread.Sleep(200);
return(myvalue);
}