Hi. I'm in a VS2019 project. My RadzenDataGrid Data is a IEnumerable ieMyType= Enumerable.Empty(); When I select a MyType object from a dropdown I add this selection to ieMyType. Being IEnumerable, fist I convert ieMyType to List, then add the dropdown selection to the List and finally convert the List to ieMyType again. The same steps when I need to remove or reorder the items in ieMyType.
In your example to add new rows for instance, you load Data with a List object (IList orders;). I tried to use List instead of IEnumerable but it just doesn't load my MyType object. It doesn't through an exception, but no data load.
Any Idea why this behaviour? can you confirm that Data property accepts IList?