ASP.NET: How to access Session from handler?

i’m trying to store some values in the Session from a Handler page, before i do a redirect to a WebForms page, that will pick up the Session values and pre-fill the WebForm:

public class Handler : IHttpHandler
{
   public void ProcessRequest(HttpContext context)
   {
      ...
      context.Session["StackOverflow"] = "overflowing";
      context.Response.Redirect("~/AnotherPage.aspx");
      ...
   }
   ...
 }

Except context.Session object is null.

How do i access Session state from a handler?

Answers:

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Method 1

Implement the System.Web.SessionState.IRequiresSessionState interface

public class Handler : IHttpHandler, System.Web.SessionState.IRequiresSessionState 
{   
  public void ProcessRequest(HttpContext context)  
  {      
    context.Session["StackOverflow"] = "overflowing";      
    context.Response.Redirect("~/AnotherPage.aspx");      
  }

}

Method 2

Implement IRequiresSessionState

Method 3

Does implementing iRequiresSessionState resolve this?

What about doing an IHttpModule instead and overriding BeginRequest?

    public void Init(HttpApplication application)
    {
        application.BeginRequest += new EventHandler(context_BeginRequest);
    }

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