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Bitmap bmp1 = new Bitmap("1.bmp");
Bitmap bmp2 = new Bitmap("2.bmp");
Bitmap bmpDst = new Bitmap(bmp1.Width, bmp1.Height * 2);
Graphics g = Graphics.FromImage(bmpDst);
g.DrawImage(bmp1, 0, 0);
g.DrawImage(bmp2, 0, bmp1.Height);
g.Dispose();
bmpDst.Save("target.bmp");
bmpDst.Dispose();
bmp2.Dispose();
bmp1.Dispose();