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
}