time data from SQL Server Compact databases
如何使用Visual Studio 2010，WinForm，C＃.NET，.NET Framework 4.0从SQL Server Compact数据库（* .sdf文件）获取实时数据以更新控件（Label和DataGridView）。
There are some solutions for this problem. On the database side, you can use Event Notifications where you can subscribe to the changes occurring in the database and handle the events. Another would be polling, that is monitoring your database by constantly running queries and checking changes.
您可以使用longpoll阅读本网站长时间轮询阅读
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