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Callback Mode

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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.