No Have Permission To Use The KILL Stmt

I am using the kill statement to terminate a process, and this is done through my VB.net program. But I get the error

User does not have permission to use the KILL statement

This is the store procedure to call for kill statement..Is there any problem to execute it on dinamic sql?


CREATE PROCEDURE Kill_Process
@DBName VARCHAR(100),
@TableName VARCHAR(1000)
AS
SET NOCOUNT ON;
DECLARE @spid smallint;
DECLARE @spid2 smallint;
DECLARE @loginame nchar(128);
DECLARE @nsql NVARCHAR(4000);
SET @loginame = 'xxxx'

EXEC Find_Lock_Info @DBName, @TableName

DECLARE ProcessCursor CURSOR FOR
SELECT spid FROM master.dbo.sysprocesses
WHERE dbid = db_id(@dbname) AND loginame = rtrim(@loginame) AND spid <> @@spid
AND spid IN (SELECT spid FROM dbo.tbl_Lock_Info where dbid = db_id(@DBName) AND OBJECT_NAME(ObjId) = @TableName)


OPEN ProcessCursor;
FETCH NEXT FROM ProcessCursor INTO @spid;
WHILE @@FETCH_STATUS = 0
BEGIN
SET @nsql = 'KILL ' + CONVERT(nvarchar,@spid) + '';
EXEC sp_executesql @nsql;
FETCH NEXT FROM ProcessCursor INTO @spid;
END
CLOSE ProcessCursor;
DEALLOCATE ProcessCursor;
GO


CREATE PROCEDURE Find_Lock_Info
@DBName VARCHAR(100),
@TableName VARCHAR(1000)
AS

SET NOCOUNT ON

BEGIN
CREATE TABLE #tmpLockInfo
(
spid SMALLINT,
dbid SMALLINT,
ObjId INT,
IndIdSMALLINT,
Type NCHAR(4),
ResourceNCHAR(32),
ModeNVARCHAR(8),
StatusNVARCHAR(5)
)

INSERT INTO #tmpLockInfo
(
spid, dbid, ObjId, IndId, Type, Resource, Mode, Status
)
EXEC Lock_Info

TRUNCATE TABLE tbl_Lock_Info

INSERT tbl_Lock_Info
SELECT
spid, dbid, ObjId, Type, Status
FROM #tmpLockInfo WHERE dbid = db_id(@DBName) AND ObjId <> 0 AND OBJECT_NAME(ObjId) = @TableName


END
GO