Hi George,
Thanks for contacting syncfusion support.
Sorry for this inconvenience caused. We have refresh the online documentation for dropdownlist. Please refer the link: https://help.syncfusion.com/aspnet-core/dropdownlist/getting-started
You can pass a value field data into ej-for. For an example : You have display & value property data. You can pass a value property data into strBands.It will be set at initial time. We have prepared a sample based on your requirement.
Please refer the sample link:
Regards,
Karthikeyan V.