Upload and attach an image to a Tweet

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VB

.NET

twitter

Does anyone have VB.net code for using https://upload.twitter.com/1.1/media/upload.json to attach an image to a Tweet?

Have tried using twurl to diagnose what is going on.

When I try:
C:\Temp>twurl -H upload.twitter.com -X POST "/1.1/media/upload.json" --file "\file.jpg" --file-field "media"

I get back: Any idea whats causing this. The image file is small (165kb)
{"request":"\/1.1\/media\/upload.json","error":"[JPEG] Ran out of bytes to parse (null)."}