C # applications to model client / server?How do I get data on the server side client to authenticate in c#?

See more:

C#

C#4.0

I want to write a software application in a client / server to install the LAN. In the matter of concern is the user authentication application. Do not know which authentication to use the knowledge to do? And do it like?
Describe the process of the machine as follows: Users in a LAN domain login, then login privileges to the application in the separation of powers inherent in the application - depending on the functions and powers to users right to do on that application. Login information must be submitted on the application server (not necessarily a domain controller machine) to authenticate with the database, not directly connected to the database for authentication at the client ( due to security requirements). Who can you suggest to do this, especially the sending of login information and return the results validate the user how. In c # there are ways to support this?