Validate against user account

Hello.. if given a username/password.. is there an API or framework class that I can utilize to see if the user credentials match those of a user on the domain or NT Security system?

basically, instead of checking the username/password against a user table in my db, i want to check it against the networks NT user database.

Thanks,
-Matt

Did you Ever Figure this out - or how to create a user and set a password.

This might be what you are looking for.

System.Security.Principal.WindowsPrincipal