Kick expire close all user connection from Sql Server 2005 / 2008 Database

In some cases DBA's need to expire or close all connections from SQL server 2005 / SQL server 2008 database such as for attach detach DataBase, Make DB readonly, perform maintenance tasks etc. For such type of issues DBA wants to get exclusive access to the database. To do so, you can set the database to Single User Mode, which permits only one database connection at a time. At that moment if