An interesting and useful class which is used to store two related objects.

The Pair class does not encapsulate its object references, First and Second, in properties; it exposes them directly to all calling code as public class fields.

The Pair class can be used in several ways in page state persistence implementations. The most common use is as a container for both the ViewState and ControlState collections. In this case, the First property is used for ViewState, and the Second for ControlState. 

 Source URL: http://msdn2.microsoft.com/en-us/library/system.web.ui.pair.aspx

1) How to Register User Controls and Custom Controls in Web.config

2) Creating and Using User Control Libraries 

3) Register Custom Controls In Web.config 

This class serialises the view state for a Web Forms page. It cannot be inherited.

 Source URL http://msdn2.microsoft.com/en-us/library/system.web.ui.losformatter.aspx

If you are looking for a URL to compare all versions of the Visual Studio 2008 editions, here we go:

http://msdn2.microsoft.com/en-us/vstudio/products/cc149003.aspx

When we have the following ADO.NET code:

which calls a SQL Server stored procedure that includes this statement: