DatagridView save Change to database

This is all of the code:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace CustomerMaintenance

public partial class CustomerMaintenanceForm : Form

public CustomerMaintenanceForm()

private void customersBindingNavigatorSaveItem_Click(object sender, EventArgs e)

string Msg = "Requested changes have been made to the database.";

this.Validate();

this.customersBindingSource.EndEdit();

this.customersTableAdapter.Update(this.northwindDataSet.Customers);

private void CustomerMaintenanceForm_Load(object sender, EventArgs e)

// TODO: This line of code loads data into the 'northwindDataSet.Customers' table. You can move, or remove it, as needed.

this.customersTableAdapter.Fill(this.northwindDataSet.Customers);

this.Top=20;

this.Left = this.Top;

this.lblInstructions.Text = "";

private void btnExit_Click(object sender, EventArgs e)

private void customersDataGridView_CellEndEdit(object sender, DataGridViewCellEventArgs e)

lblInstructions.Text = "";

customersDataGridView.Rows[e.RowIndex].ErrorText = "";

private void customersDataGridView_DataError(object sender, DataGridViewDataErrorEventArgs e)

lblInstructions.Text = "Invalid input. Re-enter";

customersDataGridView.Rows[e.RowIndex].ErrorText = "Invalid input. Re-enter";

e.Cancel = true;