Asp.net ScreenShot ( Client )

I'm working on Map.  I want to save the screen image at the locally and server . The following codes are working locally. However, the server side fails to reach the screen image. 

"Bitmap Screenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);

Graphics GFX = Graphics.FromImage(Screenshot);

GFX.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size);

string Path = "/uploaded/goruntu.jpg";

Screenshot.Save(Path, ImageFormat.Jpeg);" 

I want to take a picture, such as the following link from.

"http://ctrlq.org/screenshots/" Example (https://twitter.com)

Javascript code that I need to do this, run the local side, such as.  

How can I do this?