How to Kill all sql server process

Sometimes we need to kill all sql server transactions to perform any task.If you have to do this pls follow any one of the given steps.

1-Through management studio,when you will try to detach the db there is a option to kill all process,kill all process from here but after this click on cancel button rather than ok button.If you click on ok db will be detached.

2-Run below cmds:
ALTER DATABASE YourDatabase SET SINGLE_USER WITH ROLLBACK IMMEDIATE
--do you stuff here
ALTER DATABASE YourDatabase SET MULTI_USER

3-Script to accomplish this, replace 'DB_NAME' with the database to kill all connections to:

USE master
GO

SET NOCOUNT ON
DECLARE @DBName varchar(50)
DECLARE @spidstr varchar(8000)
DECLARE @ConnKilled smallint
SET @ConnKilled=0
SET @spidstr = ''

Set @DBName = 'DB_NAME'
IF db_id(@DBName) < 4
BEGIN
PRINT 'Connections to system databases cannot be killed'
RETURN
END
SELECT @spidstr=coalesce(@spidstr,',' )+'kill '+convert(varchar, spid)+ '; '
FROM master..sysprocesses WHERE dbid=db_id(@DBName)

IF LEN(@spidstr) > 0
BEGIN
EXEC(@spidstr)
SELECT @ConnKilled = COUNT(1)
FROM master..sysprocesses WHERE dbid=db_id(@DBName)
END