GitHub

DevExpress-Examples/asp-net-web-forms-combo-box-add-items-in-multi-column-mode

Combo Box for ASP.NET Web Forms - How to add items to an editor on the client in multi-column mode This example demonstrates how to create a multi-column combo box editor and populate it with items on ...
GitHub

allow-users-to-add-items-to-an-unbound-combo-box.md

Create a combo box called Colors on a form. Set the combo box's LimitToList property to Yes. To populate the combo box, set the combo box's RowSourceType property to Value List. Supply a list of ...
Simon Fraser University

Using the Combo Box Control

allowNewItems attribute Specify whether or not users can add to the list of items that appear in the combo box at run-time. You can also query or set this attribute ...