Reading user credential in RESTful web service

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ASP.NET

.NET

I have a RESTful web service
While consuminig the web service, in the POST method I am passing the user credential as given below.

httpRequest.Credentials = new NetworkCredential("username", "password");

How can I retrieve this username and password in the CRUD operations of the RESTful web service( httphandler class) to compare them with the database. I have the following function for READ operation.

private void READ(HttpContext context)
{


}