protected void CouponCheck_Click(object sender, EventArgs e)
        {
            MessageUserControl.TryRun(() => {
                RentalController rentalcontroller = new RentalController();

                //remove thing
                rentalcontroller.Cancel_Rental(int.Parse(CouponID.Text));
            }, "Rental Canceled", "Cancelled the current rental");
        }
        protected void CancelButton_Click(object sender, EventArgs e)
        {
            int rentalID = int.Parse(RentalID.Text);

            MessageUserControl.TryRun(() => {
                RentalController rentalcontroller = new RentalController();

                //remove thing
                rentalcontroller.Cancel_Rental(rentalID);
            }, "Rental Canceled", "Cancelled the current rental");

            //refresh
        }