What does IsPostBack actually mean?

Question

I am interested to know what specifically Page.IsPostBack means. I am fully aware of it\'s day to day use in a standard ASP.NET page, that it indicates that the user is sub

Answer 1

Generally a you could view a PostBack as a combination of:

1. HTTP request method equals "POST"
2. HTTP header HTTP_REFERER equals the current URL

That's not 100% foolproof tho, it does not take into account any state of any kind (which you probably want even if you don't know it) but it is a post, back to the current page.