ASP.NET Tutorial/Page Lifecycle/previous page

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Get previous page (C#)

<%@ 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 />";
            }
        }
    }
}


Performing Cross-Page Posts

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button Search</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblSearch"
        Text="Search:"
        Runat="server" />
    <asp:TextBox
        id="txtSearch"
        Runat="server" />
    <asp:Button
        id="btnSearch"
        Text="Go!"
        PostBackUrl="NextPage.aspx"
        Runat="server" />
    </div>
    </form>
</body>
</html>
File: NextPage.aspx
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load()
    {
        if (PreviousPage != null)
        {
            TextBox txtSearch = (TextBox)PreviousPage.FindControl("txtSearch");
            lblSearch.Text = String.Format("Search For: {0}", txtSearch.Text);
        }
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button Search Results</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblSearch"
        Runat="server" />
    </div>
    </form>
</body>
</html>


Use PreviousPage.FindControl to get a control in Previous Page (VB.net)

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button Search</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblSearch"
        Text="Search:"
        Runat="server" />
    <asp:TextBox
        id="txtSearch"
        Runat="server" />
    <asp:Button
        id="btnSearch"
        Text="Go!"
        PostBackUrl="NextPage.aspx"
        Runat="server" />
    </div>
    </form>
</body>
</html>
File: NextPage.aspx

<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    Sub Page_Load()
        If Not IsNothing(PreviousPage) Then
            Dim txtSearch As TextBox = CType(PreviousPage.FindControl("txtSearch"), TextBox)
            lblSearch.Text = String.Format("Search For: {0}", txtSearch.Text)
        End If
    End Sub
    
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button Search Results</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblSearch"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Page_Lifecycle/previous_page&oldid=3201»