C# 打印屏幕 |GDI+ 中发生一般错误

所以我有这个表单，如果用户按下按钮，则执行此方法：

//Takes a screenshot of the screen to send it with the email
    private void screenshot()
    {
        Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
        Graphics graphics = Graphics.FromImage(printscreen as Image);
        graphics.CopyFromScreen(0,0,0,0, printscreen.Size);
        printscreen.Save(@"C:'Users'*******'Desktop", ImageFormat.Jpeg);
    }

但是当我按下按钮时，出现以下错误：GDI+ 中发生一般错误。

有什么想法吗？

提前谢谢。