WCF Service Authentication

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authentication

WCFServices

Hi
I have built a test WCF Service using article CREATE RESTful WCF Service API Using POST: Step By Step Guide[^]

The reason I did this is because I need to provide service for a 3rd party to post data to.
At the moment the service does not have any authentication at all. And I need to add this in. I have read various articles and cannot find anything that quite fits my requirements.
The articles I have read mention passing the user credentials in the WebRequest header, but I don't want to do it this way.

I want the client to be able to enter the WebRequest Credentials (req.Credentials = new NetworkCredentials("username", "password"); But I can't find how I read that in in the service and then authenticate the passed credentials.

Any Ideas? Or are there any articles that explain how to do this?

Thanks in advance.

Carl