Killing all Sql Server Data Bases

Declare @DBName varchar(50), @withmsg bit
Set @withmsg=1
Set @DBName='yourdatabasenmame' ---Change your databasename here
SET NOCOUNT ON
DECLARE @spidstr varchar(8000)
DECLARE @ConnKilled smallint
SET @ConnKilled=0
SET @spidstr = ''
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
IF @withmsg =1
PRINT  CONVERT(VARCHAR(10), @ConnKilled) + ' Connection(s) killed for DB '  + @DBName
GO

Note: Change the databasename for @DBName variable