Cross Page Posting Post Back Properties

<%@ Page Language="C#" AutoEventWireup="true"  
  CodeFile="Default.aspx.cs" 
  Inherits="Default_aspx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Cross-Page Posting</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Cross-Page Posting</h1>
     Select your favorite activity:&nbsp;
     <asp:DropDownList ID="ddlFavoriteActivity" runat="server" AutoPostBack="true">
      <asp:ListItem Text="Eating" />
      <asp:ListItem Text="Sleeping" />
      <asp:ListItem Text="Programming" />
     </asp:DropDownList>
     <br />
     <br />
     <br />
     <asp:Button ID="btnServerTransfer" runat="server" 
      Text="Server.Transfer" 
      OnClick="btnServerTransfer_Click" />
     <asp:Button ID="btnRedirect" runat="server" 
      Text="Response.Redirect" 
      OnClick="btnRedirect_Click" />
     <asp:Button ID="btnCrossPage" runat="server" 
      Text="Cross-Page Post" 
      PostBackUrl="NextPage.aspx" />
    <br />
    <br />
    IsPostBack:    
     <asp:Label ID="lblIsPostBack" runat="server" Text="not defined" />
     <br />
    IsCrossPagePostBack:
     <asp:Label ID="lblIsCrossPagePostBack" runat="server" Text="not defined" />
     <br />
    PreviousPage:
     <asp:Label ID="lblPreviousPage" runat="server" Text="not defined" />
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
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;
using System.Threading;      //  necessary for ThreadAbortException

public partial class Default_aspx : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
     lblIsPostBack.Text = IsPostBack.ToString();
     lblIsCrossPagePostBack.Text = IsCrossPagePostBack.ToString();
     if (Page.PreviousPage != null)
       lblPreviousPage.Text = Page.PreviousPage.Title;
    }

  protected void btnServerTransfer_Click(object sender, EventArgs e)
   {
     Server.Transfer("NextPage.aspx");
   }

  protected void btnRedirect_Click(object sender, EventArgs e)
   {
     Response.Redirect("NextPage.aspx");
   }
}

File: NextPage.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" Inherits="NextPage_aspx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Target Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Target Page.</h1>
    
    Your favorite activity is
     <asp:Label ID="lblActivity" runat="server" Text="unknown" />
    <br />
    <br />
    IsPostBack:    
     <asp:Label ID="lblIsPostBack" runat="server" Text="not defined" />
     <br />
    IsCrossPagePostBack:
     <asp:Label ID="lblIsCrossPagePostBack" runat="server" Text="not defined" />
     <br />
    PreviousPage:
     <asp:Label ID="lblPreviousPage" runat="server" Text="not defined" />
     <br />
    Previous Page IsPostBack:
     <asp:Label ID="lblPreviousPageIsPostBack" runat="server" Text="not defined" />
     <br />
    Previous Page IsCrossPagePostBack:
     <asp:Label ID="lblPreviousPageIsCrossPagePostBack" runat="server" Text="not defined" />
    </div>
    </form>
</body>
</html>

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 NextPage_aspx : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     if (Page.PreviousPage != null)
     {
       DropDownList ddl = (DropDownList)Page.PreviousPage.FindControl("ddlFavoriteActivity");
       if (ddl != null)
         lblActivity.Text = ddl.SelectedItem.ToString() + " (late-bound)";
     }

     lblIsPostBack.Text = IsPostBack.ToString();
     lblIsCrossPagePostBack.Text = IsCrossPagePostBack.ToString();
     if (Page.PreviousPage != null)
     {
       lblPreviousPage.Text = Page.PreviousPage.Title;
       lblPreviousPageIsPostBack.Text = Page.PreviousPage.IsPostBack.ToString();
       lblPreviousPageIsCrossPagePostBack.Text = Page.PreviousPage.IsCrossPagePostBack.ToString();
     }

    }
}
Related examples in the same category

1.	Simple cross page posting
2.	Post data to another page using the cross-page posting features of ASP.NET 2.0 and 3.5.
3.	The target page binds to the previous-page class type.
4.	Response.Redirect
5.	Access previous page
6.	Find control from previous page
Cross Page Posting Post Back Properties : Cross page posting « Page « ASP.Net

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