合并两张图片

Bitmap XXXX(Bitmap b1,Bitmap b2){    Bitmap newBitmap=new Bitmap(Math.Max(b1.Width,b2.Width),b1.Height+b2.Height);    Graphics g=Graphics.FromImage(newBitmap);    g.DrawImage(b1,0,0);    g.DrawImage(b2,0,b1.Height);    g.Dispose();    return newBitmap;}