Описание тега sqlcachedependency
Establishes a relationship between an item stored in an ASP.NET application's Cache object and either a specific SQL Server database table or the results of a SQL Server 2005 query
System.Object
. System.Web.Caching.CacheDependency
.. System.Web.Caching.SqlCacheDependency
Namespace: System.Web.Caching
Assembly: System.Web (in System.Web.dll)
On all supported versions of SQL Server (Microsoft SQL Server 7.0, Microsoft SQL Server 2000, and SQL Server 2005) the SqlCacheDependency class monitors a specific SQL Server database table. When the table changes, items associated with the table are removed from the Cache, and a new version of the item is added to the Cache.
http://msdn.microsoft.com/en-us/library/system.web.caching.sqlcachedependency.aspx