2个页面间不通过Session与url的传值方式

下面是全部代码，已经编译通过。
Chuandi（传递）是名字空间

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="传"></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="返回"></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="上页传来的是："+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");
  }
 }