asp.net mvc 4 - how to get user info in Forms Authentication Across Applications? -

i have application on main domain user can login domain , authenticate across sub domain use form authentication , works fine.

but not know how retrieve users information on sub domain . must have user id or somethings use retrieve user information sql server.

how can handle scenario , transfer useful information use on sub domains retrieve user information?

my application on mvc4 razor , .net 4.5.

if user can authenticate across of subdomains, , leveraging forms authentication, can username in subdomains same way can in main domain:

httpcontext.current.user.identity.name