How do I add custom content to a HttpWebRequest header in VB.Net

I currently have a HttpWebRequest wcustom header written in defined as:

Dim request As HttpWebRequest = CType(WebRequest.Create(url), HttpWebRequest)
            request.Method = "POST"
            request.Headers.Add("X-SessionID", sessionID)
            request.ContentType = "application/json; charset=utf-8"

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I need to add in the content as below created using PHP/JS.

$options = array(
  'http' =>
  array (
    'method'        => 'POST',
    'header'        => 'X-SessionID: ' . $MY_SESSION_ID . "\r\n" .
                       'Content-Type: application/json',
    'content'       => json_encode($mylist1),
    'ignore_errors'  => true,

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How do I do this?
Spike UKCTOAsked:
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KimputerIT ManagerCommented:
If you read this MS document carefully, you can find out all the answers:

Your request code is almost complete, missing only the data itself. If you read the example code here:
You'll see 1 byte being transmitted. Replace it with text instead (so change to Encoding.ASCII.GetString), and the correct content.

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Spike UKCTOAuthor Commented:
Very clear- thanks
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Visual Basic.NET

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