Is postback works only in pageload?

问题

May be this question seems illogical but i want to explore it. I have if statement and i want to postback page within that statement but not in page load. my code is

if (Request.QueryString["HotelID"] != null)
            {
                //here i want to set autopostback true
            }

so my page post back when it have query string.

来源：https://stackoverflow.com/questions/15540048/is-postback-works-only-in-pageload