private void addButton_Click(object sender, RoutedEventArgs e) { String MenuList = null; String qurey = "select Count(MenuId) from Menu"; SqlDataReader read = DataAccess.GetData(qurey); read.Read(); Item i = new Item(menuItemsTextBox.Text, read.GetInt32(0)); i.CategoryId = categoryNameComboBox.Text; ItemService Is = new ItemService(); Is.AddMenuItem(i); MessageBox.Show(menuItemsTextBox.Text); String query1 = "select MENUNAME from MENU where CATEGORYID = '" + categoryNameComboBox.Text + "'"; SqlDataReader reader = DataAccess.GetData(query1); if (reader.HasRows) { while (reader.Read()) { if (MenuList != null) { MenuList = MenuList + "," + reader.GetString(0); } else { MenuList = reader.GetString(0); } } } String query2 = "update CATEGORY set MENULIST ='" + MenuList + "' where CATEGORYID='" + categoryNameComboBox.Text + "' "; DataAccess.ExecuteQuery(query2); MessageBox.Show("Menu Successfully Added", "Information", MessageBoxButton.OK, MessageBoxImage.Information); LoadData(); }