Vb.net http post and response from server

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VB

HI , I try POST on server some text but on server nothing came. I use a source:
How to: Send data by using the WebRequest class - .NET Framework | Microsoft Docs[^]
t

I edit it for vb.net with small diference: I need use specify port, I dont known if I wrote this well:

WebRequest.Create("http://10.000.10.123:1234")

, but when I run a code reply from server is "ok" in output.

What I have tried:

My code:

Dim request As WebRequest = WebRequest.Create("http://10.000.10.123:1234")
        request.Method = "POST"
        Dim postData As String = "GENESYS_TEST."
        Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
        request.ContentType = "application/x-www-form-urlencoded"
        request.ContentLength = byteArray.Length
        Dim dataStream As Stream = request.GetRequestStream()
        dataStream.Write(byteArray, 0, byteArray.Length)
        dataStream.Close()
        Dim response As WebResponse = request.GetResponse()
        Console.WriteLine((CType(response, HttpWebResponse)).StatusDescription)

        Using CSharpImpl.__Assign(dataStream, response.GetResponseStream())
            Dim reader As StreamReader = New StreamReader(dataStream)
            Dim responseFromServer As String = reader.ReadToEnd()
            Console.WriteLine(responseFromServer)
        End Using

        response.Close()
    End Sub

    Private Class CSharpImpl
        <Obsolete("Please refactor calling code to use normal Visual Basic assignment")>
        Shared Function __Assign(Of T)(ByRef target As T, value As T) As T
            target = value
            Return value
        End Function