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Callback Mode

CallBackPageSize = 15
EnableCallbackMode = True

The DevExpress ASP.NET Autocomplete Combo Box (ASPxComboBox) allows items to be loaded from the server on demand via callbacks, if its EnableCallbackMode property is set to true. For instance, list items that are not currently displayed within the editor's dropdown window can be loaded dynamically when an end-user scrolls the list. In this mode, the CallBackPageSize property defines the number of items to be obtained from the server each time it's required. This mode makes the first page load much faster, since only a few items need to be loaded initially.

Local Copy of this Demo
To inspect the source code for this demo on your machine, you must first install our components via the DevExpress Components Installer
You can open a local copy of this online demo directly from this webpage (if using v20.2.8, 21.1.4 or higher)
Open CS Solution
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The source code files for this demo are installed (by default) in the following directories:
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\CS\ASPxEditorsDemos
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\VB\ASPxEditorsDemos