title: How to add desktop path to app.config file?
body: <p>I am creating an C# win form application where user can specify any location to save a file. But, in default I need to provide the desktop path. But the desktop path changes depend on the Windows version, I found that:
   <code>Environment.GetFolderPath(Environment.SpecialFolder.Desktop);</code> 
  can get the desktop path of any windows version. But the problem is how do I add this code to <code>App.config</code> file? Is there are special xml code block for this.</p>