How to implement Navigation to ViewControlller on RowSelect delegate method in Xamarin.ios? -

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i working navigation table view view controller, when clicking row got exception system.nullreferenceexception has been thrown object reference not set instance of object in xamarin.ios 

public override void row selected (uitableview tableview, nsindexpath indexpath) {     // error system.nullreferenceexception     _contact.navigationcontroller.pushviewcontroller(new incomingscreen(),true);  }


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