sql database creating but some error will come

1.       Go to Server Explorer in VS

2.       Right-click Data Connections and select Add Connection

3.       Change Data Source to be Microsoft SQL Server Database File (so we can use SQLX)

4.       Enter the full path to the database file you want to create

5.       Leave Windows authentication checked.

6.       Click the Advanced button and make sure Integrated Security and User Instance are both true

7.       Finish out the dialog to create the DB file

8.       Right-click the new connection in Server Explorer and delete it

9.       Go to Solution Explorer

10.    Right-click Add\Existing Item and select the database file

11.    You should get to the DS Configuration Wizard at this point

OR 

Check this thread

http://social.msdn.microsoft.com/Forums/en/csharpide/thread/f3dffc61-2acb-4111-a8b9-743230af8a37