关于MemoryStream
如下面的程序，就是截图，然后保存到流，但是不论我截的是什么图，ms里面的值都一样，请高人指点，我实在不知道哪里错了

MemoryStream ms = new MemoryStream();
            Rectangle SelectionRectangle = new Rectangle(0, 0, 500, 500); 
            using (Bitmap bitmap = new Bitmap(SelectionRectangle.Width,SelectionRectangle.Height))
            {
                using (Graphics g = Graphics.FromImage(bitmap))
                {
                    g.CopyFromScreen(new Point(0,0), new Point(0,0),
                        SelectionRectangle.Size);
                }
                bitmap.Save(ms, ImageFormat.Bmp);
                bitmap.Dispose();
            }

[解决办法]
using (Bitmap image = new Bitmap(10,10)) {
using (Graphics g = Graphics.FromImage(image)) {
g.Clear(Color.Red);
}
using (MemoryStream m = new MemoryStream()) {
image.Save(m, ImageFormat.Png); imageData = m.ToArray();
}
}