vyměním-li connectionstring za tento, ukáže to error:

Nelze najít instalovatelnou metodu ISAM.

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: Nelze najít instalovatelnou metodu ISAM.

A to na řádku:

objConn.Open();