i am creating website using asp.net C# and sql server 2005. in my website i have search page in this page i have two dropdownlist box and one text box and one search button two radio buttons. i have product table and city table . in product table i have conatact_person comanyname,and so on. in city table city ,area . when user select first dropdownlist corresponding value will be added in second dropdownlist for example user select chennai from ddl1 the corresponding values like tambaram guindy,vadapalani, all are added automatically in ddl2. now user enter search keyword in textbox and then user click the search button. it will display search result in gridview .the grid view must have the edit and delete option when the user want to edit or delete it must refelect in database. give clear idea and coding step by step explanation.