NET profiling API), and an extensive client-side API designed to mirror many of the control schemes seen in the ASP. This whitepaper examines the XML Triggers functionality of the ASP. XML Triggers give granular control over the components that can cause partial rendering for specific Update Panel controls. NET AJAX Extensions, previously an add-on assembly targeted at ASP. Triggers for a given Update Panel, by default, automatically include any child controls that invoke a postback, including (for example) Text Box controls that have their event.This whitepaper is based on the Beta 2 release of the . Remember that Pages are stateless, and so you should re-register these controls every time they are created.One of which is the Triggers element, which specifies the controls on the page (or the user control, if you are using one) that will trigger a partial render of the Update Panel control in which the element resides. NET technology brings an object-oriented and event-driven programming model and unites it with the benefits of compiled code.

This trigger element can also be used to force a full page render when a control would otherwise normally trigger a partial page render (for instance, when a (Click to view full-size image) Utilizing the example we just constructed, we can take a look at what ASP.

NET AJAX is doing and how our Update Panel cross-panel triggers work. Both of these tools are freely available online, and can be found with an internet search.

When I select the first item, Button will be as Post Back Trigger and do full postback.

When I select the second item, Button will be as Async Post Back Trigger and do partial postback.

As we can see, because no special code is utilized to perform an AJAX postback, the AJAX client script library is able to intercept form postbacks without any additional code.

Server controls automatically utilize Java Script so that they do not automatically submit the form - ASP.

NET AJAX to be injected into the page nonintrusively, helping to avoid any potential breaking changes that might occur by utilizing a possibly-imprecise string replacement.

Furthermore, this enables functionality corresponds to the values initialized in the Page Request Manager call to _update Controls (note that the ASP.

In the first parameter, it is composted by "t"/"f" and Update Panel ID.