vb.net receiving response from a php script - php

Question

My application (written in vb.net) send data to a php script hosted on one of the free webhosting servers. The php script evaluates the data, and responds accordingly. The response from the server looks something like this:
Valid
<!-- Hosting3322 Analytics Code -->
<script type="text/javascript" src="theurlforthewebsite/count.php"></script>
<!-- End of Analytics Code -->
'Valid' is from my php script. Rest of is a little script by the server that they hide in every page.
Here is the php script:
<?php
$d = $_POST['mac'];
if($d=='45bgd0434')
echo "Valid";
else
echo "Invalid";
?>
Here is my vb.net code:
' Create a request using a URL that can receive a post.
Dim request As WebRequest = WebRequest.Create("http://sitename.com/verify.php")
' Set the Method property of the request to POST.
request.Method = "POST"
' Create POST data and convert it to a byte array.
Dim postData As String = "mac=45bgd0434"
Dim byteArray As Byte() = Encoding.UTF8.GetBytes(postData)
' Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded"
' Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length
' Get the request stream.
Dim dataStream As Stream = request.GetRequestStream()
' Write the data to the request stream.
dataStream.Write(byteArray, 0, byteArray.Length)
' Close the Stream object.
dataStream.Close()
' Get the response.
Dim response As WebResponse = request.GetResponse()
' Get the stream containing content returned by the server.
dataStream = response.GetResponseStream()
' Open the stream using a StreamReader for easy access.
Dim reader As New StreamReader(dataStream)
' Read the content.
Dim responseFromServer As String = reader.ReadToEnd()
' Clean up the streams.
reader.Close()
dataStream.Close()
response.Close()
MessageBox.Show(responseFromServer)
I would just like to have only the output and not that extra code. Is there any way I can use an alternative method to print in PHP, or probably another method with which I can talk to the server?
I have tried other free servers on the internet, but they all seem to put in some code. Would really appreciate your help.