Locking file problem

[kam]

I use the server explorer to drap and drop an Access
Table into a Web Form. so the oleDbconnection and
oldebdataadapter object were created.

Then I right click on the olddbdataadapter and select
generate a DataSet.

Then I put a DataGrid and use the builder to config it.

Then I fil and Databind it.

When I run it, there is an error 'Could not lock file' on
the OlddbDataAdapter.Fill(DataSet) line

pls help.
What's configuration that I need to setup?