关于用ASP.Net识别远程主机服务器种类

代码如下（从我的Web追捕里找出来的，用VB.Net）

            Dim swWriter As StreamWriter
            '用以向网络基础数据流传送数据
            Dim nsStream As NetworkStream
            '创建发送数据的网络基础数据流
            Dim tcpClient2 As TcpClient
            '通过它实现向远程主机提出TCP连接申请
            Dim sHostName As String
            Dim srRead As StreamReader
            '从网络基础数据流中读取数据
            'HTTP服务追捕
            If TcpConnect(ZSIP, 80) = "CG" Then
                OppHTTP.Text = "HTTP服务已开启！服务软件类型：未知"
                Try
                    'tcpClient = New TcpClient(IPAddress, Port)
                    tcpClient2 = New TcpClient(ZSIP.ToString(), 80)
                    tcpClient2.ReceiveTimeout = 1000000
                    tcpClient2.SendTimeout = 1000000
                    '对远程主机的8000端口提出TCP连接申请
                    nsStream = tcpClient2.GetStream()
                    '通过申请，并获取传送数据的网络基础数据流
                    swWriter = New StreamWriter(nsStream)
                    swWriter.WriteLine("Get /index.htm HTTP/1.1")
                    swWriter.WriteLine("Host:" & IP.Text)
                    swWriter.WriteLine("Accept:*/*")
                    swWriter.WriteLine("Referer:")
                    swWriter.WriteLine()
                    '刷新当前数据流中的数据
                    swWriter.Flush()
                    srRead = New StreamReader