The C1ComboBox control supports filling the dropdown list dynamically as the user scrolls. You can fill the list by using two different methods: OnItemPopulate or OnCallbackDataBind.

If the C1ComboBox is not bound to a datasource, you can populate the items using the corresponding properties:

OnItemPopulate :

• EnableCallBackMode: true
• CallbackDataPopulate:ItemPopulate
• OnItemPopulate

The OnItemPopulate event will be raised when C1ComboBox requests data from client side.

 

CallbackDataBind:

• EnableCallBackMode: true
• OnCallbackdatabind

The OnCallbackDatabind event will be raised when C1ComboBox requests data from the data source.