如何在C#中获取我所在页面的完整URL

using System;
using System.Web;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string fullUrl = HttpContext.Current.Request.Url.ToString();
        Response.Write("当前页面的完整URL是：" + fullUrl);
    }
}