devexpress spreadsheet decimal value type

https://www.devexpress.com/Support/Center/Question/Details/T231674/support-for-the-decimal-data-type-on-the-cell

Hello Alex,
The decimal type is not supported in MS Excel. All decimal values are stored as double values in an MS Excel document and our internal model.
Thus, you need to convert decimal values to double before assigning them with the SpreadsheetControl cell values. Alternatively, you can use the Cell.SetValue method: