I'm getting error occurred when taking screenshort using mvc4 c#

public ActionResult Capture(PrtScreen prt, string command)
{

    if (command == "Save")
    {

         int screenWidth = Screen.GetBounds(new Point(0, 0)).Width;
        int screenHeight = Screen.GetBounds(new Point(0, 0)).Height;
        Bitmap bmpScreenShot = new Bitmap(1920, 1080);
        Graphics gfx = Graphics.FromImage((Image)bmpScreenShot);
        gfx.CopyFromScreen(0, 0, 0, 0, new Size(screenWidth, screenHeight));
        bmpScreenShot.Save("d:\\example.jpg", ImageFormat.Png);

    }

    return View();
}