Not Updating the physical database table (Access Database table)

Hi folks,
I am learning the winForms following the tutorial as the following uri:
http://msdn.microsoft.com/vstudio/ex...er3/begin9/cs/

SQL Express 2005 and Access are the available choices for the studio
express. In order not to conflict the sql 2005 for work, I choosed the Access
database.

Everything are going well. I have only one problem. The physical
Access table is not updated. The related code is listed as below:

private void button1_Click(object sender, EventArgs e)
{
this.bindingSource1.EndEdit();
int result = 0;
result = this.customerTableAdapter1.Update
(this.customerDataSet1.Customer);
MessageBox.Show(result.ToString());

}
Please advise. Thanks.
Peter