When you create an interface, you're basically creating a prototype/blueprint of functions that classes using the interface must implement in order to be valid...

In this article i am giving you a very usefull example, that is when you choose the country in a dropdown list which is filled dynamically and want the state comes in another dropdown will depend on the first dropdown list. To remove this post back i use ajax here.

Query notification is a feature included in Microsoft SQL Server 2005 that allows applications to be notified when data has changed.

Microsoft Message Queuing (MSMQ) technology enables applications running at different times to communicate across different networks and even the systems that may be available.