Get hostname & display on screen...

I have some code which looks like this:
<%@ Register TagPrefix="SMWC" Namespace="SSWeb.Skins._controls" Assembly="SSWeb" %>
<%@ Page language="C#" Codebehind="Login.aspx.cs" AutoEventWireup="false" Inherits="SSWeb.Login" %>
<%@ Register TagPrefix="STWC" Namespace="SmarterTools.Web.Controls" Assembly="SmarterTools.Web" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
      <HEAD>
            <META name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
            <META name="CODE_LANGUAGE" content="C#">
            <META name="vs_defaultClientScript" content="JavaScript">
            <META name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
            <LINK href="Skins/_default/Skin.css" type="text/css" rel="stylesheet">
      </HEAD>
      <BODY>
            <form id="Form1" method="post" runat="server">
                  <ASP:TEXTBOX id="txtSiteID" runat="server" wrap="False" maxlength="250" width="200" columns="25"></ASP:TEXTBOX>
                  <!-- more ... //-->
            </form>
      </BODY>
</HTML>

Basically, I want the txtSiteID to have the address hostname, so if the address bar was showing this:
http://www.domain.tld/site.aspx

I would like the txtSiteID to have a value of:
'www.domain.tld'

As you can see this may not be stright forwards as I have some CodeBehind and Inherits, and I'm not 100% sure how this works with the current form. I also do not have access to it's code.
aproxityAsked:
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YZlatCommented:
try this:

Dim hostname as String=Environment.MachineName
0
svyCommented:
use Request.Url.Host

MachineName can be different from actual HostName
0

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