Updating database with ajax
When working in the markup editor in Visual Studio, you may notice (from Intelli Sense) that there are two child elements of an Update Panel control.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.Often web developers love to use AJAX in their applications because of the elegance in use and the beautiful interface options.AJAX update can be a very useful tool to modify or access database tables without render of pages from the server or navigating to a different page.In this way, your web application becomes smart and sleek.Most of all, the numerous page loads can be avoided; thus making the user’s experience much easier.This allows you the greatest flexibility in assigning which specific controls may invoke a page render, and is recommended, so that a developer will opt-in to respond to an event, rather than handling any events that may arise.Note that when Update Panel controls are nested, when the Update Mode is set to Conditional, if the child Update Panel is triggered, but the parent is not, then only the child Update Panel will refresh.
Furthermore, the Sql Data Source and Access Data Source controls can be used to both access and modify data; however, this article only examines accessing data.
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.
Automatic child trigger inclusion can also be disabled (so that child controls that create postbacks do not automatically trigger partial renders) by setting the property to false.
With the declarative, "code free" Data Source controls you can create a page that displays database data in under 15 seconds and without having to write a line of code. Both controls have virtually the same featureset, the only difference being how you specify the connection information.
In fact, the Access Data Source control is really superfluous since Microsoft Access databases can be accessed through the Sql Data Source control just as easily.