how to access web service without credentials ?

i am saving data after modification. but i got an error:

 "Dynamic SQL generation is not supported against a SElect Command that does not return any base table information."

i debugged it, i got this error on DataAdapter. Dataset contains updated value but on filling Database (Access) is not updated and gives error.

i have a primary key "Serial Number" i am not updating it.. but use it for getting row where to update.

Kindly give me suggestion how to resolve this issue..

Regardz

Muhammad Ahsan shakir