asp.net 2。0图片 操作方式，剪切，

public void Clone_Output(int x, int y, int w, int h, string imgname, string ok)
{
Bitmap myBitmap = new Bitmap(Server.MapPath("~/") + imgname);
Bitmap sltimg = new Bitmap(myBitmap, w, h);
Rectangle cloneRect = new Rectangle(x, y, 142, 168);
System.Drawing.Imaging.PixelFormat format = myBitmap.PixelFormat;
Bitmap cloneBitmap = sltimg.Clone(cloneRect, format);
cloneBitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
if (ok == "yes")
{
cloneBitmap.Save(Server.MapPath("~/") + "clone_" + imgname);
}
myBitmap.Dispose();
sltimg.Dispose();
cloneBitmap.Dispose();
}