C# 存储过程返回影响行数

ALTER PROCEDURE [dbo].[P_CSM_UpdateHandleResultEmpName]
 @HandleIndex int=-1
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

   update a set a.FromEmpName=b.empname from HandleResult a left join users b on a.FromUserName=b.openid 
    where a.HandleIndex>@HandleIndex and a.FromEmpName is null and b.empname is not null 
   select @@rowcount  --这里返回影响行数
END

        private int UpdateHandleResultEmpName()
        {
            SqlConnection con = new SqlConnection("你的数据库连接字符串");
            SqlCommand com = con.CreateCommand();
            com.CommandType = CommandType.StoredProcedure;
            com.CommandText = "P_CSM_UpdateHandleResultEmpName"; //存储过程名称
            con.Open();
            int rowcount = Convert.ToInt32(com.ExecuteScalar());
            con.Close();
            return rowcount;
        }