Nine Options for Managing Persistent User State in Your ASP.NET Application… one of the basic things to learn when you start ASP.NET training… :) I am forgetting simple things…

so the methods are

1. Application
2. Cookies
3. Form Post / Hidden Form Field
4. Query String
5. Session
6. New State Containers in ASP.NET
7. Cache
8. Context
9. ViewState
10. Web.config and Machine.config Files
11. Profile (ASP.NET 2.0) ??

more details are on MSDN