ASP.NET 获取客户端访问端口

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

public partial class _Default : System.Web.UI.Page
{

private void Page_Load(object sender, System.EventArgs e)
{
System.Collections.Specialized.NameValueCollection coll = Request.ServerVariables;

foreach (string key in coll.AllKeys)
{
foreach (string value in coll.GetValues(key))
{
Response.Write(key + "------" + value + "<br/>");
}
}

string port = Request.ServerVariables["REMOTE_PORT"].ToString();
Response.Write(port);

}

}