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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="CrossPage1" %>

<!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>CrossPage1</title>
</head>
<body>
    <form id="form1" runat="server" >
    <div>
        First Name:
        <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
        <br />
        Last Name:
        <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Button runat="server" ID="cmdPost" 
                PostBackUrl="NextPage.aspx" Text="Cross-Page Postback" /><br />
        <asp:Button runat="server" ID="cmdTransfer" Text="Manual Transfer" OnClick="cmdTransfer_Click" Visible="False" />
    </div>
    </form>
</body>
</html>

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();
    }


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

    public string FullName
    {
        get { return txtFirstName.Text + " " + txtLastName.Text; }
    }

}


File: NextPage.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" Inherits="CrossPage2" %>

<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server" >
    <div>
        <asp:Label ID="lblInfo" runat="server"></asp:Label></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 CrossPage2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (PreviousPage != null)
        {
            lblInfo.Text = "You came from a page titled " +
                PreviousPage.Title + "<br />";

            CrossPage1 prevPage = PreviousPage as CrossPage1;
            if (prevPage != null)
            {
                lblInfo.Text += "You typed in this: " + prevPage.FullName +
                  "<br />";
            }
        }
    }
}








5.6.previous page
5.6.1.Get previous page (C#)
5.6.2.Performing Cross-Page Posts
5.6.3.Use PreviousPage.FindControl to get a control in Previous Page (VB.net)