Application, server, and Session Object

Introduction to the Global. asax File

 

• Stored in applicationsProgramIn the root directory

• Define application boundaries

• Initialize application-level or session-level variables

• Connect to the database

• Send cookie

Global. asax event

Event	Trigger time
Application_onstart	This is triggered when the first ASP. NET page of the current application directory (or its subdirectory) is called.
Application_onend	Triggered when the last session of the application ends. In addition, it is triggered when you use the Internet Service Manager Management Unit to stop web applications.
Application_onbeginrequest	It is triggered at the beginning of each page request (theoretically, when the page is loaded or refreshed.
Application_onendrequest	It is triggered at the end of each page request (that is, every time the page is executed in the browser.
Session_onstart	It is triggered at the beginning of each new session.
Session_onend	It is triggered at the end of the session. (For more information about how to end a session, see session object ).

Httpapplication class

• Define methods, attributes, and events common to all application objects in ASP. NET Applications

• This class is the base class of the application defined by the user in the global. asax file.

• Such instances are created in the ASP. NET infrastructure, rather than directly created by users.

• An instance is used to process multiple requests within its lifetime, but it can only process one request at a time.

Httpapplicationstate class and application instance

• The httpapplicationstate class enables global information sharing between multiple sessions and requests in ASP. NET Applications

• The Application Object obtains the current state of the application.

• The application object can be obtained through attributes of the httpapplication class or page class.