Comapre

        private void Compare()
        {
            int flag = 0;
            int count1 = 0;
            int count2 = 0;
            string img1_ref, img2_ref;
            Bitmap img1 = new Bitmap(@"c:\Fotky\Obrazok1.bmp");
            Bitmap img2 = new Bitmap(@"c:\Fotky\Obrazok1por.bmp"); // originál
            if (img1.Width == img2.Width && img1.Height == img2.Height)
            {
                for (int i = 0; i < img1.Width; i++)
                {
                    for (int j = 0; j < img1.Height; j++)
                    {
                        img1_ref = img1.GetPixel(i, j).ToString();
                        img2_ref = img2.GetPixel(i, j).ToString();
                        if (img1_ref != img2_ref)
                        {
                            count2++;
                            flag = 1;
                            break;
                        }
                        count1++;
                    }
                }
                if (flag == 1)
                {
                    Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);

                    Graphics graphics = Graphics.FromImage(printscreen as Image);

                    graphics.CopyFromScreen(17, 231, 1885, 1054, printscreen.Size);

                    printscreen.Save(@"C:\Fotky\Obrazok1.bmp");
                    System.Threading.Thread.Sleep(650);
                    Compare();
                }
                else
                {
                    click6();
                }
            }
            this.Dispose();
        }