ASP.Net/Page/Cross page posting

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Access previous page

<%@ 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="ddlActivity" 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 />
     <asp:Label ID="lblMessage" runat="server" />
     
    
    </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)
    {
     lblMessage.Text = "";
    }
  public DropDownList FavoriteActivity
  {
    get { return ddlActivity; }
  }
 
  protected void btnServerTransfer_Click(object sender, EventArgs e)
   {
     try
     {
       Server.Transfer("NextPage.aspx");
     }
     catch (ThreadAbortException ex)
     {
     }
     catch (Exception ex)
     {
       lblMessage.Text = "Exception: " + ex.Message;
     }
   }
  protected void btnRedirect_Click(object sender, EventArgs e)
   {
     try
     {
       Response.Redirect("NextPage.aspx");
     }
     catch (Exception ex)
     {
       lblMessage.Text = "Exception: " + ex.Message;
     }
   }
 }
 
File: NextPage.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" Inherits="NextPage_aspx" %>
<%@ PreviousPageType VirtualPath="~/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>Target Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Target Page.</h1>
    
    Your favorite activity is&nbsp;
     <asp:Label ID="lblActivity" runat="server" Text="unknown" />
    
    </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)
    {
     lblActivity.Text = PreviousPage.FavoriteActivity.SelectedItem.ToString();
    }
}



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();
     }
    }
}



Find control from previous page

<%@ 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:ListItem Text="Watching TV" />
      <asp:ListItem Text="Sex" />
      <asp:ListItem Text="Skiing" />
      <asp:ListItem Text="Bicycling" />
     </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" />
    </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)
    {
    }
  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" />
    
    </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)";
     }
    }
}



Post data to another page using the cross-page posting features of ASP.NET 2.0 and 3.5.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" %>
<!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>Simple cross-page posting</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:MultiView ID="MultiView1" runat="server">
                <asp:View runat="server" ID="ChooseActionView">
                    <h3>
                    I want to
                    <asp:DropDownList ID="DropDownList1" 
                                      runat="server" 
                                      AutoPostBack="True" 
                                      OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                        <asp:ListItem>Hire </asp:ListItem>
                        <asp:ListItem>Buy </asp:ListItem>
                        <asp:ListItem>Spy </asp:ListItem>
                    </asp:DropDownList>
                    </h3>            
                </asp:View>
                <asp:View runat="server" ID="ShowResultsView">
                    <asp:Label runat="server" ID="Msg" /><br /><br />
                    <asp:LinkButton ID="LinkButton1" 
                                    runat="server" 
                                    OnClick="LinkButton1_Click">Choose an action</asp:LinkButton>
                </asp:View>
            </asp:MultiView>
            <hr />
            <h3>Post to another page</h3>
            <p>(<strong>NB:</strong> Try typing <em>AAA</em>)</p>
            Name:
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" 
                                        runat="server" 
                                        ControlToValidate="TextBox1"
                Text="*" />
            <asp:CustomValidator 
                 ID="CustomValidator1" 
                 runat="server" 
                 Text="*" 
                 ControlToValidate="TextBox1" 
                 OnServerValidate="CustomValidator1_ServerValidate" />
            <asp:Button ID="Button1" 
                        runat="server" 
                        Text="Apply request..." 
                        OnClick="Button1_Click" 
                        PostBackUrl="NextPage.aspx" />
            <br />
        </form>
    </div>
</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.HtmlControls;
using System.IO;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (!IsPostBack)
      MultiView1.ActiveViewIndex = 0;
    }
  protected void Button1_Click(object sender, EventArgs e)
  {
    Response.Write("This is NOT unreachable code");
    StreamWriter w = new StreamWriter("test.txt");
    w.WriteLine("This is NOT unreachable code");
    w.Close();
  }
  protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
  {
    Msg.Text = String.Format("Congratulations! You"re going to <b>{0}</b>", DropDownList1.SelectedItem.Text);
    MultiView1.ActiveViewIndex = 1;
  }
  protected void LinkButton1_Click(object sender, EventArgs e)
  {
    MultiView1.ActiveViewIndex = 0;
  }
    protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
    {
        args.IsValid = false;
        if (String.Equals(args.Value, "AAA"))
            args.IsValid = true;
    }
}
File: NextPage.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" 
    Inherits="NextPage" %>
<!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>Welcome to the guru"s page</title>
</head>
<body>
   
    <div id="pageContent">
        <form id="form1" runat="server">        
            <h2>This is the 
                <asp:Label ID="GuruName" runat="server" ForeColor="blue" />
                home page. Thank you for requesting to 
                <asp:Label ID="GuruAction" runat="server" ForeColor="blue" />
            </h2>
        </form>
    </div>
</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.HtmlControls;

public partial class NextPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (PreviousPage == null) 
    {
      Response.Write("Sorry, you can only invoke me through cross-page posting.");
      Response.End();
      return;
    }
        if (!PreviousPage.IsValid)
        {
            Response.Write("Sorry, the original page contains invalid input.");
            Response.End();
            return;
        }
    DropDownList dd = (DropDownList) PreviousPage.FindControl("DropDownList1");
    string action = dd.SelectedItem.Text;
    GuruAction.Text = action;
    TextBox txt = (TextBox) PreviousPage.FindControl("TextBox1");
    GuruName.Text = txt.Text;
    }
}



Response.Redirect

<%@ 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="ddlActivity" runat="server" AutoPostBack="true">
      <asp:ListItem Text="Eating" />
      <asp:ListItem Text="Sleeping" />
      <asp:ListItem Text="Programming" />
      <asp:ListItem Text="Watching TV" />
      <asp:ListItem Text="Sex" />
      <asp:ListItem Text="Skiing" />
      <asp:ListItem Text="Bicycling" />
     </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 />
     <asp:Label ID="lblMessage" runat="server" />
     
    
    </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;
public partial class Default_aspx : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
     lblMessage.Text = "";
    }
  public DropDownList FavoriteActivity
  {
    get { return ddlActivity; }
  }
 
  protected void btnServerTransfer_Click(object sender, EventArgs e)
   {
     try
     {
       Server.Transfer("NextPage.aspx");
     }
     catch (ThreadAbortException ex)
     {
     }
     catch (Exception ex)
     {
       lblMessage.Text = "Exception: " + ex.Message;
     }
   }
  protected void btnRedirect_Click(object sender, EventArgs e)
   {
     try
     {
       Response.Redirect("NextPage.aspx");
     }
     catch (Exception ex)
     {
       lblMessage.Text = "Exception: " + ex.Message;
     }
   }
 }
 
File: NextPage.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" Inherits="NextPage_aspx" %>
<%@ PreviousPageType VirtualPath="~/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>Target Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1>Target Page.</h1>
    
    Your favorite activity is&nbsp;
     <asp:Label ID="lblActivity" runat="server" Text="unknown" />
    
    </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)
    {
     lblActivity.Text = PreviousPage.FavoriteActivity.SelectedItem.ToString();
    }
}



Simple cross page posting

<%@ 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>
     <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" />
    </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;
public partial class Default_aspx : System.Web.UI.Page 
{
  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#" %>
<!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>
    </div>
    </form>
</body>
</html>



The target page binds to the previous-page class type.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="DefaultWithType"%>
<!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 with type information</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:MultiView ID="MultiView1" runat="server">
                <asp:View runat="server" ID="ChooseActionView">
                    <h3>
                    I want to
                    <asp:DropDownList ID="dropDownList1" 
                                      runat="server" 
                                      AutoPostBack="True" 
                                      OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                        <asp:ListItem>Hire</asp:ListItem>
                        <asp:ListItem>Buy</asp:ListItem>
                        <asp:ListItem>Spy</asp:ListItem>
                    </asp:DropDownList>
                    </h3>            
                </asp:View>
                <asp:View runat="server" ID="ShowResultsView">
                    <asp:Label runat="server" ID="Msg" /><br /><br />
                    <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Choose an action</asp:LinkButton>
                </asp:View>
            </asp:MultiView>
            <hr />
            <h3>Post to another page</h3>
            Name:
            <asp:TextBox ID="textBox1" runat="server"></asp:TextBox>
            <asp:Button ID="Button1" runat="server" Text="Apply request..." OnClick="Button1_Click" 
                PostBackUrl="NextPage.aspx" />
            <br />
        </form>
    </div>
</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 DefaultWithType : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (!IsPostBack)
      MultiView1.ActiveViewIndex = 0;
    }
  protected void Button1_Click(object sender, EventArgs e)
  {
  }
  protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
  {
    Msg.Text = String.Format("Congratulations! You"re going to <b>{0}</b>", DropDownList1.SelectedItem.Text);
    MultiView1.ActiveViewIndex = 1;
  }
  protected void LinkButton1_Click(object sender, EventArgs e)
  {
    MultiView1.ActiveViewIndex = 0;
  }
  
  public DropDownList DropDownList1
  {
    get { return dropDownList1; }
  }
  public TextBox TextBox1
  {
    get { return textBox1; }
  }
}
File: NextPage.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="NextPage.aspx.cs" 
    Inherits="NextPage" %>
<%@ PreviousPageType VirtualPath="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>Welcome to the guru"s page</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <h2>This is the 
                <asp:Label ID="GuruName" runat="server" ForeColor="red" />
                home page. Thank you for requesting to 
                <asp:Label ID="GuruAction" runat="server" ForeColor="red" />
            </h2>
        </form>
    </div>
</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.HtmlControls;

public partial class NextPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (PreviousPage == null) 
    {
      Response.Write("Sorry, you can only invoke me through cross-page posting.");
      Response.End();
      return;
    }
    string action = PreviousPage.DropDownList1.SelectedItem.Text;
    GuruAction.Text = action;
    GuruName.Text = PreviousPage.TextBox1.Text;
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.Net/Page/Cross_page_posting&oldid=2274»