Monday, May 11, 2009

Avoiding unnecessary server work in ASP.Net

[This was originally posted at]

One of the best ways to increase performance in ASP.Net pages is to not do any unnecessary server-side work. For example, every postback and callback will re-trigger the entire Page's server life cycle - rerunning OnInit, OnLoad, OnPreRender, etc... However, a server-side action only require a fraction of the original code to run - for example clicking a button may not require you to repopulate all dropdowns.

Is PostbackClicking an ASP.Net button postbacks the pagethis.IsPostBack
Is CallbackA JavaScript triggers an ASP.Net 2.0 callbackthis.IsCallback
Is RedirectingA method has called Response.Redirect, but there is still heavy processing (that is now unnecessary) that will still be called.Response.IsRequestBeingRedirected
Is Ajax update panel postbackA button within an Ajax update panel has been clicked, but don't redo server work outside of that update panelpublic static bool IsPartialPostback(System.Web.UI.Page p)
return ((System.Web.UI.ScriptManager.GetCurrent(p) != null)
&& (System.Web.UI.ScriptManager.GetCurrent(p).IsInAsyncPostBack))
Is Button clickUser clicks exit button - no need to repopulate dropdownsRequest["__EVENTTARGET"] //indicates which event (like a button) triggered the postback.


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