1. UpdatePanel Best Practices

2. Normal Page life cycle browser • Control treecreation • ViewStatedeserialization • DataBinding • HTML generation HTTP GET HTML Page init load render

3. Postback Page life cycle Browser ___doPostBack • Control treecreation • ViewStatedeserialization • ProcessPostData • IPostBackDataHandler • DataBinding • ProcessPostData • IPostBackEventHandler • HTML generation __EVENTTARGET  ClientID of postback control__EVENTARGUMENT  Optional argument HTTP POST HTML Page init load render

4. Source : http://blogs.developpeur.org/cyril/archive/2006/09/14/Cycle-de-vie-d-une-page-ASP-net.aspx

5. UpdatePanel • Partial-page rendering in a box • Clean round trips to server and flicker-free updates • Requires no knowledge of JavaScript or AJAX • Use XMLHttpRequest • AJAX (Asynchronous JavaScript And XML)

6. AsyncPostback Page life cycle Browser ___doPostBack MS Ajax __doPostBack HTTP POST XMLHttpRequest Partial HTML HTML Page init load render Ms Ajax Render

7. Best Practices • Use triggers • AsyncPostBackTriger • PostbackTrigger • Use SriptManager.IsInAsyncPostback • Use UpdateMode.Conditional • Default value isAllways • Call .Update() method • ReduceUpdatePanel size • 2 smallUpdatePanelisbetterthan a big one • Use ScriptManager in MasterPage • Use ScriptManagerProxy in the content Page

8. Pros & Cons • Pros • Veryeasy to use • Postbackphilosophy • No new concept to understand • No JavaScript • Cons • No JavaScript • Expensive • Full Postback • Large network exchange • Client Performance problem

9. Alternative • JQuery • Framework for JavaScript developper • Easy DOM manipulation • www.jquery.com Client / Browser Server MyPage.aspx Layout / HTML HTML JavaScript MyDataservice.svc Data / JSON • DataService • SOA approch • ASP.net as a service • Pure JavaScript