The DataContext property you are trying to use is originating from the FrameworkElement class from which RadSpreadsheet inherits. You can read more about the property here
For the time being we do not support passing a collection to RadSpreadsheet and displaying it automatically. You can do that by enumerating the collection and setting cells values in a row for every record. You can read more on how to use our spreadsheet component here
If you have any other questions do not hesitate to contact us again.
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