Session state, application state and view state is used to manage state in ASP.NET.
Application state is stored in a key/value dictionary that is created during each request to a specific URL. You can add your application-specific information to this structure to store it between page requests. Once you add your application-specific information to application state, the server manages it.
Application state is put away in a key/esteem word reference that is made during each solicitation to a particular URL. You can add your application-explicit data to this design to store it between page demands. When you add your application-explicit data to application express, the server oversees it.