4 Types of Programming model for ASP.NET

1. MVC

2. Web Pages

3. Single Page Applications

4. Web Forms

URL: https://docs.microsoft.com/en-us/aspnet/web-forms/what-is-web-forms

ASP.NET Session State Service

Start aspnet_state service in Services app Before debugging (depends on the settings)

On Web.Config

<sessionState mode="StateServer" stateConnectionString="tcpip=localhost:42424" cookieless="false" timeout="20" />