How to force WebRequest to send Authorization header during POST

Question

When using WebRequest to send a POST, the Authorization header is not sent with the request even though I have manually set the header and set PreAuthenticate to true, eg:

Answer 1

This drove me bonkers, but eventually found the answer in Adding Headers and Post data in RESTfull/HTTP Request in C#.

The solution for me was adding the Authorization Header BEFORE writing the request stream.

Hope this helps.