Error occured on Work with database

Hi Guru!

I have following problem:

I write Web applicatin in C#, which working with database.

All work perfect, but suddenly on one of updates of data in database, my class
which work with database return Unspecified error.
After this all application begin return following error.

After iis reset all return to work correctly.

The application begin to do problem randomaly(not every time) but I think (not sure) on the same page which make number (7-10) inserts into database.

Description error:
Unspecified error
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.OleDb.OleDbException: Unspecified error

Source Error:


Line 447: /// error ocurred
Line 448: /////////////////////////
Line 449: throw e;
Line 450: }
Line 451:

How can I solve this problem.
Thanks