c# - Using Orchard login in external site

Question

I'm developing a web application in C# called "ProjectX" and a Orchard Site (1.6). I want to use Orchard users and roles in "ProjectX". The idea is centralize the login manager in one site only (Orchard).

Basically the user do the logon on Orchard Site and he'll redirect for "ProjectX", after that I need use the roles for some process, e.g:

if (role == "customer") 
 call method1();
else
 call method2();

We want the fairly easy solution to do that and I notice that Orchard creates two Cookies after SignIn process but I don't know if it can help me on validation.

Is it possible to do? Could anyone help me with ideas?

Thanks!