public ApproveServiceRequest()
 {
     InitializeComponent();
     try
     {
         values  = DBManager.selectForServiceApproval();
         valuesC = values.Clone();
         approved_Items.ItemsSource          = valuesC.AsDataView();
         approve_service_request.ItemsSource = values.AsDataView();
     }
     catch
     {
     }
 }