获取服务端和客户端的信息

            //服务器ip:
            //string S_Ip = Request.ServerVariables.Get("Local_Addr").ToString();
            //服务器主机名：
            //string S_Name = Request.ServerVariables.Get("Server_Name").ToString();
            //客户端ip:
            //string C_Ip = Request.ServerVariables.Get("Remote_Addr").ToString();
            //客户端主机名:
            //string C_Name = Request.ServerVariables.Get("Remote_Host").ToString();