ASP.NET Tutorial/Page Lifecycle/URL

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Determine the current URL:

Request.RawUrl returns the original URL (before being remapped).
Request.Path returns the current URL (after being remapped).
Request.AppRelativeCurrentExecutionFilePath returns the application relative URL (after being remapped).
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
    void Page_Load()
    {
        if (String.rupare(Request.Path, Request.RawUrl, true) != 0)
            lblMessage.Text = "The URL to this page has changed, " +
                "please update your bookmarks.";
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Default Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblMessage"
        CssClass="message"
        Runat="server" />
    
    The original request was for:
    <blockquote>
        <%=Request.RawUrl%>
    </blockquote>
    which got remapped to:
    <blockquote>
        <%= Request.Path %>
    </blockquote>
    and the application relative version is:
    <blockquote>
        <%= Request.AppRelativeCurrentExecutionFilePath %>
    </blockquote>
    </div>
    </form>
</body>
</html>


Remapping URLs in your application"s web configuration file

Remap the Home.aspx page to the Default.aspx page.
File: Web.Config
<configuration>
<system.web>
  <urlMappings>
    <add
      url="~/Home.aspx"
      mappedUrl="~/Default.aspx"/>
  </urlMappings>
</system.web>
</configuration>
The tilde character (~) represents the current application root. 
A forward slash (/) at the start of a URL represents the website root.


Request.RawUrl

<%@ Page Language="C#" Trace="true" TraceMode="SortByTime" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="HelloWorldCodeBehind" %>
<!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 runat="server">
    <title>Hello World Inline</title>
</head>
<body>
    <form id="form1" runat="server">
    <h1>Hello World</h1>
    The date is <em>
    <asp:Label ID="labDate" runat="server"></asp:Label>
    </em>
    </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 HelloWorldCodeBehind : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       labDate.Text = Request.RawUrl;
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Page_Lifecycle/URL&oldid=3202»