Not able to set raddatepicker value in querystring

Hi friends,
when using the following code
Server.Transfer("Customer.aspx?StartDate=" + RadDatePicker2.SelectedDate.Value.ToShortDateString() + "&EndDate=" + RadDatePicker2.SelectedDate.Value.ToShortDateString() + "&CustomerType=" + ddlCustomer.SelectedItem.Value); I am not able to get the raddatepicker values  in the customer.aspx page but i am getting the CustomerType value. The  code lies in the button click event. IS the value being lost on the clicking the button.?