Enforce SQL Server to drop a database

When I'm using Management Studio Express to drop a database there is an checkbox "Close existing connections." which close open database a开发者_JAVA百科nd enforce it to drop.

How can i drop a database programmatic by closing open connections and check it's ever exists before?

---

The output of the "script" icon on the drop screen, as suggested in the comments by Randolph Potter (this assumes that your database name is "test"):

EXEC msdb.dbo.sp_delete_database_backuphistory @database_name = N'test'
GO
USE [master]
GO
ALTER DATABASE [test] SET  SINGLE_USER WITH ROLLBACK IMMEDIATE
GO
USE [master]
GO
/****** Object:  Database [test]    Script Date: 06/30/2010 09:12:29 ******/
DROP DATABASE [test]
GO