Hi Amine
Thank you for contact Syncfusion support.
We have analyzed your query “Error while tried to bind the collection to the SfMultiColumnDropDownList”. We are not able to reproduce the reported problem Its working fine in our simple application. We suspect the view for the SfMultiColumnDropDownList is empty due to some of the Binding problem in your application. Could you please ensure the binding path for the SfMultiColumnDropDownList in your application. If you still facing the same problem means kindly revert us more information about the problem in your application or kindly share the application to ourself it will helpful for us to analyze further.
Regards,
Balamurugan R