private void AddTable_OnClick(object sender, RoutedEventArgs e) { var proxy = new RestaurantServiceClient(); var table = new Table { NoSeats = Convert.ToInt32(TextBoxSeatsPerTable.Text), RestaurantId = Convert.ToInt32(HiddenResId.Content.ToString()) }; if (ValidateTable(table)) { proxy.CreateTableAsync(table); ToTableDataGrid(); } else { MessageBoxResult prompt = MessageBox.Show("Please enter valid characters in all fields", "Invalid Input"); } }