How to force SQLconnection to release a database???

I have written a small application, that can restore a database (C# and SQL2005), but after I have accessed the database, I can't drop it - it says that it is in use.. I guess it has to do with the SQLconnection-pooling, but can I force it to relase the database??

From stackoverflow

• Specify 'Pooling=False' in the connection string.

• If you utlise

  Using SQLConnection
      '' do your stuff here
  End Using
  

  I think this then forces the freeing of resources after it exits

• Call "USE SomeOtherDB" (e.g Master) to close your own connection, or one of

  ALTER DATABASE SET SINGLE_USER

  or

  ALTER DATABASE SET SINGLE_USER WITH ROLLBACK_IMMEDIATE

  to close other connections. The first waits for connections to conclude, the second is immediate.

• Dispose your SqlConnection object.