2. Server – Side State Management
  • Application State:- Application State information is available to all pages, regardless of which user requests a page. For More Details Click Here   
  • Session State:– Session State information is available to all pages opened by a user during a single visit.  For More Details Click Here  

Both application state and session state information is lost when the application restarts. To persist user data between application restarts, you can store it using profile properties.