I have attached a very small program reading a cell value from an attached Excel-file. If you open the Excel file, this specific cell has a value. In Aspose.Cell this cell has no value (valuetype= IsNull).
Thank you for the project.
Please check the attached snapshot for the spreadsheet view in Excel. You will notice that the cell referenced in your code (D389) does not have any value so the result produced by Aspose.Cells for .NET API is correct.