The handle is invalid
   at System.Drawing.Graphics.CopyFromScreen(Int32 sourceX, Int32 sourceY, Int32 destinationX, Int32 destinationY, Size blockRegionSize, CopyPixelOperation copyPixelOperation)
   at TestSupport.WinAPI.Support.TestSupport.WinAPI.ITestSupport.MakeScreenShot(String FileName)

private static Bitmap bmp;
        private static Graphics gfx;

        void ITestSupport.MakeScreenShot(string FileName)
        {
            try
            {
                if (bmp == null)
                    bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height,
                        PixelFormat.Format24bppRgb);

                if (gfx == null)
                    gfx = Graphics.FromImage(bmp);

                gfx.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0,
                    Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);

                bmp.Save(FileName, ImageFormat.Png);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message + "\n" + e.StackTrace);
            }
        }