This post explains what needs to be done in order to display a value rather than an ID in a cell and in a combobox editor.
[quote]Please write all the necessary codes in XAML (especially the Bindings
everywhere!) and in C# that is needed to solve this problem. I’d like
to ask you not to suggest to me any sample codes because in those there
are pre-filled into-dll-compiled datasets what are so far away from
The above-mentioned post provides all the XAML and the bindings that are required. How and where a DataTable is filled does not influence the code since a DataTable is being used in both cases.