switch case not working

DateTime BorrowDate = DateTime.Now;
     switch (TxtB_Area.Text)
        {
            case "Teachers Reference":
                TxtB_DateReturned.Text = BorrowDate.AddMonths(1).ToShortDateString();
                break;
            case "General Circulation":
                TxtB_DateReturned.Text = BorrowDate.AddDays(1).ToShortDateString();
                break;
            case "Fiction Area":
                TxtB_DateReturned.Text = BorrowDate.AddDays(14).ToShortDateString();
                break;
            case "Multimedia Area":
                MessageBox.Show("This Resource Is For Room or Library Use Only.");
                return;

            case "Comics Area":
                MessageBox.Show("This Resource Is For Room or Library Use Only.");
                return;
        }