private async void FinalizeAdd_btn_Click(object sender, RoutedEventArgs e)
        {
            addSalesPersonError_lbl.Content = "";
            if (!Int32.TryParse(salesPersonId_txtblk.Text, out int salesPersonId))
            {
                addSalesPersonError_lbl.Content = "Only Integer SalesPersonId's Please";
                return;
            }
            if (!Int32.TryParse(relationTypeId_txtblk.Text, out int relationTypeId))
            {
                addSalesPersonError_lbl.Content = "Only integer RelationTypeId's, please";
                return;
            }
            var response = await _districtService.CreateSalesPersonToDistrict(_district.DistrictId, salesPersonId, relationTypeId);

            if (response.HttpResponse == HttpStatusCode.OK)
            {
                addSalesPersonToDistrict_grid.Visibility = Visibility.Hidden;
            }
            addSalesPersonError_lbl.Content = response.Message;
        }