Ali,

>I assigned :
> BindingSource : Customer
> BindingSourceDisplayMember : CompanyName
> BindingSourceValueMember : CustomerID
>
>I filled the below event:
>
>private void cboCustomers_SelectedIndexChanged(object sender, System.EventArgs e)
> {
> int nIndex = this.cboCustomers.SelectedIndex;
> this.txtCustomerID.Text = this.oCustomer.GetCurrentDataSet().Tables[0].Rows[nIndex][0].ToString();
> }
>
>System is working. The question is:
>
>Is there easer way to get selected CustomerId?

Since the CustomerID is already stored in the combo box, it's easier to get the selected value from the combo box's SelectedValue property:

private void cboCustomers_SelectedIndexChanged(object sender, System.EventArgs e)
{
    this.txtCustomerID.Text = this.cboCustomers.SelectedValue;
}

Regards,