I'm using VIsual Studio .NET 2005. I have some problem with Binding Navigator: when I click save Item, the records are saved but when i close the form and open it again the data is lost??? I can't understand. The code for Binding Navigator saveitem is here:

private void friendBindingNavigatorSaveItem_Click(object sender, EventArgs e)
        {
            this.Validate();
            this.friendBindingSource.EndEdit();
            this.friendTableAdapter.Update(this.vietFriendData Set.Friend);
        }
Please help me