What is session state and ViewState?

ASP.NET session state enables you to store and retrieve values for a user as the user navigates ASP.NET pages in a Web application . HTTP is a stateless protocol. This means that a Web server treats each HTTP request for a page as an independent request.22 Eki 2014

Session state enables you to store user specific data in the memory and identify a particular request uniquely . Session data is stored as key/value pairs in the SessionStateItemCollection and can be accessed using the HttpContext. Session property.

View state can only be visible from a single page and not multiple pages. Session state value availability is across all pages available in a user session. It will retain values in the event of a postback operation occurring.30 Oca 2020

The InProc Session State Mode stores session data in a memory object in the application worker process (aspnet_wp.exe) in the application domain . It is usually the fastest, but more session data means more memory is used on the web server, and that can affect performance.