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Formula Cells get a value Of Null when Using Cells.ExportDataTableAsString

We are evaluating Aspose Excel V1.8, we noticed then when we read a spreadsheet and export it to a datatable using ExportDataTableAsString, the cells that contain a formula (say cell has =1+2) are translated to Null, if we read the cell using the cell object however we get a IntValue as 3 which is correct and a stringvalue errors out.
Is it possible to get the computed value 3 when we use ExportDataTableAsString, so that we dont have to loop thru all the cells in order to read excel.

I will investigate this problem and fix it ASAP.

Thanks for your patience.

@msdate,
Aspose.Excel is discarded now and a new product Aspose.Cells is introduced which provides rich features available in the recent versions of MS Excel. You can export data from worksheet using this new product as follows:

string filePath = dataDir + "Book1.xlsx";

// Instantiating a Workbook object
Workbook workbook = new Workbook(filePath);

// Accessing the first worksheet in the Excel file
Worksheet worksheet = workbook.Worksheets[0];

// Exporting the contents of 7 rows and 2 columns starting from 1st cell to DataTable
DataTable dataTable = worksheet.Cells.ExportDataTableAsString(0, 0, 11, 2, true);

foreach (DataRow r in dataTable.Rows)
{
    foreach (DataColumn c in dataTable.Columns)
    {
        string value = r.Field<string>(c);
        Console.Write(value + "            ");
    }
    Console.WriteLine();
}

More details about this feature are available here:
Export Data from Worksheet

Here is the link to the latest version of this product:
Aspose.Cells for .NET (Latest Version)

A detailed ready to run solution is available here for testing the features:(https://github.com/aspose-cells/Aspose.Cells-for-.NET).