Page Lifecycle ASP.Net Tutorial

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<%@ Page Language="C#" 
         AutoEventWireup="true" 
         CodeFile="Default.aspx.cs" 
         Inherits="CrossPage1" %>
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">


    CrossPage1


    
    

        Type something here:
        
                                            runat="server" 
                                    ControlToValidate="txt1"
                                    EnableClientScript="False" 
                                    ErrorMessage="This is a required field.">
        
        
                            ID="cmdPost" 
                    PostBackUrl="NextPage.aspx" 
                    Text="Cross-Page Postback" />
                            ID="cmdTransfer" 
                    Text="Manual Transfer" 
                    OnClick="cmdTransfer_Click" />
    

    


File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class CrossPage1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (Request.QueryString["err"] != null)
      Page.Validate();
    }
  public TextBox TextBox1
  {
    get { return txt1; }
  }
  protected void cmdTransfer_Click(object sender, EventArgs e)
  {
    Server.Transfer("NextPage.aspx", true);
  }
}
File: NextPage.aspx
<%@ Page Language="C#" 
         AutoEventWireup="true" 
         CodeFile="NextPage.aspx.cs" 
         Inherits="CrossPage2" %>
          "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">


    Untitled Page


    
    

    
    

    


File: NextPage.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class CrossPage2 : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    if (PreviousPage != null)
    {
      if (!PreviousPage.IsValid)
      {
        Response.Redirect(Request.UrlReferrer.AbsolutePath + "?err=true");
      }
      else
      {
        Response.Write("You came from a page titled " +
           PreviousPage.Header.Title + "        CrossPage1 prevPage = PreviousPage as CrossPage1;
        if (prevPage != null)
        {
          Response.Write("You typed in this: " + prevPage.TextBox1.Text + "");
        }
        if (PreviousPage.IsCrossPagePostBack)
        {
          Response.Write("The page was posted directly");
        }
        else
        {
          Response.Write("You used Server.Transfer()");
        }
      }
    }
  }
}