c# - Stopping a WebClient after usage in Windows Phone 8 -

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I want to stop webmail after my use but I could not find any way to do this. 

  Public Static Webclient WebClient = New WebClient ();    
 
 
 You can use:  
 For example:    var Client = new webmail (); String url = "http://example.com/parameter"; Client.BeginDownloadString (URI); client.CancelAsync ();

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