Session and url are not passed between two pages

The following is all the code, has been compiled through.
Chuandi (passing) is the namespace

WebForm1:
< %@ Page language="c#" Codebehind="WebForm1.aspx.cs" Inherits="chuandi.WebForm1" % >
< HTML >
  < HEAD >
  < title > WebForm1 < /title >
  < /HEAD >
  < body >
  < form id="Form1" method="post" runat="server" >
    < asp:TextBox id="TextBox1" runat="server" > < /asp:TextBox >
    < asp:Button id="Button1" runat="server" Text=" pass "> < /asp:Button >
  < /form >
  < /body >
< /HTML >
using System;
namespace chuandi
{
  public class WebForm1 : System.Web.UI.Page
  {
  protected System.Web.UI.WebControls.TextBox TextBox1;
  protected System.Web.UI.WebControls.Button Button1;
  public string Text1
  {
    get
    {
      return this.TextBox1.Text;
    }
  }
  private void Page_Load(object sender, System.EventArgs e)
  {}
  override protected void OnInit(EventArgs e)
  {
    InitializeComponent();
    base.OnInit(e);
  }
  private void InitializeComponent()
  {      
    this.Button1.Click += new System.EventHandler(this.Button1_Click);
    this.Load += new System.EventHandler(this.Page_Load);
  }
  private void Button1_Click(object sender, System.EventArgs e)
  {
    Server.Transfer("WebForm2.aspx");
  }
  }
}

WebForm2:
< %@ Page language="c#" Codebehind="WebForm2.aspx.cs" Inherits="chuandi.WebForm2" % >
< %@ Reference Page="WebForm1.aspx" % >
< HTML >
  < HEAD >
  < title > WebForm2 < /title >
  < /HEAD >
  < body >
  < form id="Form1" method="post" runat="server" >
    < asp:Label id="Label1" runat="server" > Label < /asp:Label >
    < asp:Button id="Button1" runat="server" Text=" return "> < /asp:Button >
  < /form >
  < /body >
< /HTML >
using System;
namespace chuandi
{
  public class WebForm2 : System.Web.UI.Page
  {
  protected System.Web.UI.WebControls.Button Button1;
  protected System.Web.UI.WebControls.Label Label1;
  public chuandi.WebForm1 wf1;
  private void Page_Load(object sender, System.EventArgs e)
  {
    if(!IsPostBack)
    {
      wf1=(chuandi.WebForm1)Context.Handler;
      Label1.Text=" from the previous page: "+wf1.Text1;
    }
  }
  override protected void OnInit(EventArgs e)
  {
    InitializeComponent();
    base.OnInit(e);
  }
  private void InitializeComponent()
  {      
    this.Button1.Click += new System.EventHandler(this.Button1_Click);
    this.Load += new System.EventHandler(this.Page_Load);
  }
  private void Button1_Click(object sender, System.EventArgs e)
  {
    Server.Transfer("WebForm1.aspx");
  }
  }