login form code help usig ms access database

[Arjay]

{"Object reference not set to an instance of an object."}

Where does this error occur? have you single stepped through the code in a debugger to find the line that throws this error?

OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=J:\enterprise web develop\enterprise\CWsystem.mdb");

You may have to escape the backslashes in this code as follows:

OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=J:\\enterprise web develop\\enterprise\\CWsystem.mdb");