WebForms MultiColumnComboBox Overview
RadMultiColumnComboBox is similar to a regular dropdown, and offers a highly simplified approach for creating columns in the dropdown.
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RadMultiColumnComboBox is available as of R1 2019 and it is a server-side WebForms wrapper over the MultiColumnComboBox for Kendo UI for jQuery widget.
Figure 1: RadMultiColumnComboBox allows you to create such a complex layout with under 20 lines of markup.
Key Features
Renders and operates on the client-side
Built-in accessibility, WAI-ARIA, keyboard and RTL support
Ability to cascade from another MultiColumnComboBox
Client templates for all components in the dropdown
Built-in grouping of the data
Client or server filtering
Integration with both client-side and server-side data sources
Rich client-side API and events