如何使用GetInsertCommand方法？

i used the named method like this:

ds.Tables("Employees").Rows.Add(ENumTxt.Text, ENameTxt.Text,PosTxt.Text,EAgeTxt.Text,_
ESalTxt.Text, EPhonTxt.Text, EAdrsTxt.Text)
If ds.HasChanges Then
            Dim AffectedDS As DataSet = ds.GetChanges(DataRowState.Added)
            Dim ComBuilder As New OleDb.OleDbCommandBuilder(da)
            da.InsertCommand = ComBuilder.GetInsertCommand()
            da.Update(AffectedDS, "Employees")
End If
ds.Tables(