Home/ Questions/Q 7858631
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-02T21:32:12+00:00

I am a bit curious how ASP.Net internally identifies that the request is a

  • 0

I am a bit curious how ASP.Net internally identifies that the request is a postback.
I have read in a Microsoft book that you can technically do a postback using both POST and GET methods
This means that commands do not have anything to do with postback.
I have tried to use Fiddler to see what the request headers are sending. I am thinking that it could be something to do with the viewstate but I am not sure.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You’re nearly right.

    The correct event is fired based on the _EVENTTARGET and _EVENTARGUMENT variables which are sent as part of the request. I believe the IsPostBack is set based on the values of these. These determine which event to fire and with what arguments.

    The actual submit is fired by the __doPostBack() function in javascript.

    More detail here: http://dotnetslackers.com/Community/blogs/haissam/archive/2007/05/18/Which-Control-Caused-PostBack_2100_.aspx

    • 0