ASP.NET pages can store Page state information between the inherently stateless HTTP request and response required to process and serve any Web page. This state is called "view state."

The default ASP.NET persistence mechanism is to store view state on the client using the HiddenFieldPageStatePersister class. Storing view state and data with each HTTP request and response performs well in general and is important in large Web farm scenarios because it does not matter which Web server services the request: the page state is available in the current context for the server to accurately render the page.

In scenarios where pages are served to small devices that have limited client-side resources or use a markup language that does not support a hidden field element, it is required to store view state on the server. Several ASP.NET device page adapters override the GetStatePersister method to return a SessionPageStatePersister object that stores page state on the server in the session object associated with the client.

The following code example demonstrates how you can write a PageAdapter class to return an instance of the SessionPageStatePersister class instead of the default HiddenFieldPageStatePersister class to save view state to the server-side session object.

Imports System.Web.UI

Namespace Samples.AspNet.VB

    Public Class MyPageAdapter
       Inherits System.Web.UI.Adapters.PageAdapter


       Public Overrides Function GetStatePersister() As PageStatePersister
          Return New SessionPageStatePersister(Page)
       End Function 'GetStatePersister

    End Class 'MyPageAdapter

End Namespace

namespace Samples.AspNet.CS {

    using System.Web.UI;

    public class MyPageAdapter : System.Web.UI.Adapters.PageAdapter {

        public override PageStatePersister GetStatePersister() {
            return new SessionPageStatePersister(Page);
        }
    }
}

• AspNetHostingPermission 

  for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.

• AspNetHostingPermission 

  for operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework

Reference