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 Bitmap isotest = new Bitmap("c:\\testbild66.bmp");   // Bild ist 64 x 64 pixel

 Rectangle rect4 = new Rectangle(0, 0, 64, 64);
            System.Drawing.Imaging.BitmapData bmpData5 =
                isotest.LockBits(rect4, System.Drawing.Imaging.ImageLockMode.ReadWrite,
                isotest.PixelFormat);

            // Get the address of the first line.
            IntPtr ptr4 = bmpData5.Scan0;

            // Declare an array to hold the bytes of the bitmap.
            int bytes4 = bmpData5.Stride * 64;

isotest.UnlockBits(bmpData5);                    

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     Point[] destinationPoints = {
                      
                         new Point(100, 100),  
                             new Point(164, 100), 
                            new Point(100, 164)};

                                    e.Graphics.DrawImage(isotest, 10,10);                    

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Rectangle rect4 = new Rectangle(0, 0, 63, 63);                    

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 e.Graphics.DrawImage(isotest, 10,10,400,400);