protected void RentalSelected_Click(object sender, ListViewCommandEventArgs e)
        {
            int rentalID = int.Parse(e.CommandArgument.ToString());

            RentalID.Text = rentalID.ToString();

            MessageUserControl.TryRun(() => {
                RentalController rntlmgr      = new RentalController();
                List <RentalDetail> rentals   = rntlmgr.Get_RentalDetailsByRentalID(rentalID);
                RentalListListview.DataSource = rentals;
                RentalListListview.DataBind();
            }, "Customer Selected", "Please select a rental by this customer");

            CustomerList.DataBind();

            //list rentals and display them same as did customers
        }