Question Sending file w/ POST DATA

[calstap]

Hello.
Im doing program that automatically uploads images/file to web server using post data.

So far ive figured out code that sends text. Now next step is to send that file instead of text and thats where I need your help.

HTML form that does the job for me is:

<form enctype="multipart/form-data" action="uploader.php" method="POST">
<input name="uploadedfile" type="file">
<input type="submit" value="Send">
</form>

And vb.net code that sends text and returns what ever my php code generates is:

Imports System.IO
Imports System.Net
Imports System.Web
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim errorString As String = "Any String"
        Dim request As WebRequest = WebRequest.Create("http://myurl.com/uploader.php")

        request.Method = "POST"
        Dim postData = "g=" & errorString

        Dim byteArray As Byte() = System.Text.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()
        dataStream = response.GetResponseStream()
        Dim reader As New StreamReader(dataStream)
        Dim responseFromServer As String = reader.ReadToEnd()
        reader.Close()
        dataStream.Close()
        response.Close()
        TextBox1.Text = responseFromServer
    End Sub
End Class

I hope some of you can help me to upgrade this code to send file