A common base class for LINQ to SQL with which you can implement code to access database easily.

WCF provides support for Stream object. It typically recommends the developer to handle the message whose size is too large as Stream object for the sake of high performance. However, there are some constraints on Stream operation that need to be noted.

WCF provides a flexible and extensible architecture for the developer. The most common situation is to customize the extension of behavior. It is not complex, but some issues should be noticed. This article discusses how to extend the behavior in WCF.