Cascade DropDownLists with Enabled Virtualization
To implement cascading DropDownLists and still virtualize the data requires you to use a custom data source configuration.
It enables the usage of the DataSourceRequest
and ToDataSourceResult
methods, which internally parse all filter and page expression information, and apply it directly to the data.
To see the example, refer to the project on how to cascade the DropDownList with enabled virtualization.