ASP.NET in a Nutshell

Name

IStateManager

Synopsis

This interface provides methods that are used to manage view state, which is the set of information that describes a control’s current state. View state is stored in a hidden field on a Web Forms page, so it can be maintained across postbacks. State management is built into the Control class, and you can write values into the Control.ViewState collection to store any information you need without using IStateManager. However, you can also create a custom control that implements this interface to customize how state management works. The IStateManager consists of three methods: SaveViewState(), which stores changes to an object, LoadViewState(), which retrieves and applies previously stored values, and TrackViewState(), which sets the IsTrackingViewState property to True and instructs ASP.NET to track changes to the control’s view state.

Public Interface IStateManager
                  ' Public Instance Properties
   Public ReadOnly Property IsTrackingViewState As Boolean  
' Public Instance Methods
   Public Sub LoadViewState(ByVal state As Object) 
   Public Function SaveViewState() As Object  
   Public Sub TrackViewState() 
End Interface