Explain asp.net page life cycle?

Asp.net page life cycle passes through some series of process during their life cycle. Following are the stages

Begin request

  • This event will show that it’s a new request
  • Object and variables are initialized in this stage
  • This event is raised on every request

Authenticate request

  • .net is ready to authenticate the user in this stage
  • Authentication code are inserted here
  • This request confirms the authentication

Authorize request

  • net is ready to authorize the user in this stage
  • Custom Authorization code can be done here
  • This request confirms the authorization of the user

Resolve request cache

  • Output cache directive is commonly used in asp.net for caching
  • After authorize request is finished, authorize will calls the cache request to serve the request.
  • During runtime asp.net can load data from cache if needed.
  • Any type of cache activity code can be written here

Map request handler

  • Checks the extension of the file
  • Checks the handler of the request

Acquire request state

  • Ready to acquire session state variables/information

Process request

  • Logic execution is done at this stage


  • Control’s id is set at this stage
  • Dynamically add controls at this stage
  • Read control properties


  • Controls are fully loaded at this stage
  • All the values are restored in this stage
  • “Ispostback” is used to avoid unnecessary state change


  • Method of page and page objects
  • Html changes can be mad lastly in this section
  • This method generates client side html and scripts to display


  • This is to clean up the code like closing connection, closing opened files
  • Page objects are unloaded from the memory

Release request state

  • Save or update session variables are done at this stage

Update request cache

  • Update cache before end of the process

End request

  • Last stage end of the request


                               Image shows the page life cycle of an event in GET and POST condition

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