Thanks for your help. Your solution works in the current situation.
but we have about 90 different object classes which fill the drop down lists.
i have to provide a solution where more number of DDL's could also be generated upon request.
in short, the number of DDL's and the number of options in each DDL, both vary from user to user.
i'd appreciate it if you could suggest some way for me to solve this. moreover i'm still new to ASP.Net.