when i execute the below code it is not working in server

Question

My code as follows

                Bitmap bitmap = new Bitmap(990, 540);

                Graphics graphics = Graphics.FromImage(bitmap as System.Drawing.Image);

                graphics.CopyFromScreen(5, 160, 0, 0, bitmap.Size);

                bitmap.Save(@"c:\\" + ddlSession.Text.ToString().Trim() + "DailySchedule.bmp", ImageFormat.Bmp);

                ShowEditLink(true);

                lblUpdate.Text = "This image is saved";

             

   The above code is working in local machine, but when i execute on the server error as follows

   System.ComponentModel.Win32Exception: The handle is invalid

    The below error shows in following line as follows

   graphics.CopyFromScreen(5, 160, 0, 0, bitmap.Size);

 

  please help me. what is the problem in my code.

Regards,

Rao.