How to get IP Address in Asp.net

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default4 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write("Your IP address is: " + Request.ServerVariables["REMOTE_ADDR"].ToString() + "<br />");

        Response.Write("You are browsing this site with: " + Request.ServerVariables["http_user_agent"].ToString() + "<br />");

        Response.Write("The method used to call the page: " + Request.ServerVariables["request_method"].ToString() + "<br />");

        Response.Write("The server's domain name: " + Request.ServerVariables["server_name"].ToString() + "<br />");

        Response.Write("The server's port: " + Request.ServerVariables["server_port"].ToString() + "<br />");

        Response.Write("The server's software: " + Request.ServerVariables["server_software"].ToString() + "<br />");

        Response.Write("The DNS lookup of the IP address is: " + Request.ServerVariables["REMOTE_HOST"].ToString());
    }
}