Hi,
*I have installed sql server 2008 management studio with "use sql server authentication".
*I have created a database with
database name:stock
owner:<default>
*In Vb.net
created a windows application;clicked on Add datasource;changed d datasource to microsoft sql server database file(SqlClient);clicked on option button use sql server authentication n then provided d user name and password;
browsed d database and clecked on open;This is when i get a error.
This is the error:
"Select sql server database file
stock.
you dont have permission to access this file
contact file owner or the administrator"

Plz let me knw the cause of d error and how to solve it

Suggest you Work with your administrators to set the proper permissions.

How to access the permissions.
What are the settings i need to do?

If you are not the system administrator, you need to work with them.

What to do depends on how your system is set up. They will know.

Is this trying to attach a SQL Server database to an instance of SQL on your desk(lap)top? If the SQL Server is remote (on a separate machine), you would certainly not get file permissions denied.