phonecalls - Trigger a phone call in Windows Phone 8 application -

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I need to develop an app to call the Windows Phone 8 app using Visual Studio.
But I did not get any resources to do this.
When a button is clicked, I have to call the mobile number already.
I'll just need to call that mobile number by clicking that button.

This is what I have coded. When a given button is clicked, I am calling this method ... 

  Private zero hyperlink button_click_1 (object sender, routing event e) {Folkoltsk folkskoltsk = new phonecoltask ( ); phoneCallTask.PhoneNumber = "0719957868"; PhoneCallTask.DisplayName = "gauge"; phoneCallTask.Show (); }   
 But I get an uncontrolled exception.  
 Unrestricted Exceptions.  
  // Code for executing unauthorized exceptions: Private Zero Application_translated exception (Object Sender, ApplicationUnhandledExceptionEventArgs e) {if (Debugger.IsAttached) {// has an unrestricted exception; Debugger debugger Break (break); }}    
 
 
 when you use  PhoneCallTask ​​ If you are, then specify a new capacity for your app in WMAppManifest.xaml:  ID_CAP_PHONEDIALER

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