Hi,
Thank you for your interest in Syncfusion products.
You can get the result from a formula instead of the formula while exporting values to a datatable by using the enum ExcelExportDataTableOptions.ComputedFormulaValues.
[C#]
//To get the result from a Formula
DataTable table = sheet.ExportDataTable(sheet.UsedRange, ExcelExportDataTableOptions.ComputedFormulaValues);
Please refer the sample in the below link which illustrates the above.
http://websamples.syncfusion.com/samples/samples/XlsIO.Web/4.4.0.51/F63549/main.htmPlease try running the above sample and let me know if this helps.
Thanks,
Melba