Monitor.CaptureScreenToMemoryStream Method

public static MemoryStream CaptureScreenToMemoryStream()
 {
     Bitmap BM = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
         Screen.PrimaryScreen.Bounds.Height);
     Graphics GH = Graphics.FromImage(BM);
     GH.CopyFromScreen(0, 0, 0, 0, BM.Size);
     MemoryStream memoryStream = new MemoryStream();
     BM.Save(memoryStream, ImageFormat.Png);
     memoryStream.Position = 0;
     return memoryStream;
 }