Am working in VS2005/SQL/VB/Windowsapp.

I first developed a windowsapp with SQL with DB in Net Server but now am coverting the same windowsapp with the local database with MS-Access. I have changed all the connection string and all SQL related statements to OleDB wherever necessary. Now the application is working fine and I could able to submit the forms and store it in local DB but the PROBLEM is when I try to edit/update I get this error:

"DBConcurrencyException was unhandled -
Concurrency violation: the UpdateCommand affected 0 of the expected 1 records."

And the breakpoint error line is: adapter.Update(dt)

Where could be the problem? PLease guide/help me. Thank you.