I know I can use the attribute [Authorize(Roles="client")] to make sure that only authenticated clients can access a page. But after that, how can I access this user's personal data? How do I programmatically get that user's account ID from that action controller?
For example, on Stack Overflow, how does my personal account page access my personal data which is stored in a database?
So far, googling "authentication", "authorization" only helped me limit access to a controller action, not how to access that user's stuff.