title: SQL dependency can not call onchange function
body: <p>When using <code>SqlDependancy</code>, when I create a new database, it works well, but the time I use it with an existing database, although I enable the broker service, and the <code>SqlDependancy.Start</code> works normally, the <code>OnChange</code> function is not called the time change data in the database. HELP!!!</p>