C# 把两张图片重叠合并

public Image UniteImage(int width,int height,Image img1,Image img2)
{
    System.Drawing.Image img = new System.Drawing.Bitmap(width, height);

    System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(img);

    g.Clear(System.Drawing.Color.Transparent);

    g.DrawImage(img1,0,0,img1.Width,img1.Height); 

    g.DrawImage(img2,0,0,img2.Width,img2.Height);

    return img;

}