使用过SQLDependency的进！解决办法

使用过SQLDependency的进！
想实现以下功能：
当数据库中某个表有数据插入的时候，执行后台方法中的代码，
于是使用SQLDependency来实现！
本想数据插入才触发的，没想到不插入数据也总是触发！
贴代码：

C# code

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data;using System.Data.SqlClient;using System.Configuration;namespace ConsoleApplication1{    class Class2    {        private static SqlConnection con = null;        private static SqlCommand com = null;        static void Main(string[] args)        {            string constr = "Data Source=.;Initial Catalog=mailmoniter;Persist Security Info=True;User ID=xxx;Password=xxxxxxxx";            SqlDependency.Start(constr);            con = new SqlConnection(constr);            com = new SqlCommand("SELECT [id],[EmailAccount],[Info],[NowTime] FROM [Mail].[dbo].[_auxUser]", con);            OutputData();            Console.ReadLine();            SqlDependency.Stop(constr);        }        static void depend_OnChange(object sender, SqlNotificationEventArgs e)        {            OutputData();        }        private static void OutputData()        {            com.Notification = null;            SqlDependency depend = new SqlDependency(com);            depend.OnChange += new OnChangeEventHandler(depend_OnChange);            try            {                con.Open();                SqlDataReader dr = com.ExecuteReader(CommandBehavior.CloseConnection);                while (dr.Read())                {                    Console.WriteLine("{0}   |   {1}", dr[0],dr[1]);                }                dr.Close();                Console.WriteLine();            }            catch(Exception e)            {                Console.WriteLine();            }        }    }}