private void btnloaddata_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                // Call the function from the View Model, then the View Model will call the
                // Model to execute these codes below and return the results here

                dataGridCustomers.DataContext = vm.CallDisplayProdinNeed();
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.ToString());
            }
            finally
            {
                conn.Close();
            }
        }