Programming Problems,REMOTING ACCESS IN C#???

Please, i am currently woking on a particular remoting-c#. I want to use a three system tiers. One would be the server, the other an Intermediate and the last one would be the Client. The client should be able to send data to the intermediate first, intermediate will sanction its validity before forwarding it to the server.The client should also be able to query the Intermediate due to access granted to it.While the intermediate would be able to access the Server remotely.The code behind is what is currently giving me concern.Please i will love great minds to help me out.Thanks.