Ok,
So I having a few issues with the sample. You have me opening a excel file that doesn't exist. I'm actually creating the Excel file dynamically in code on the server. So I tried exporting out the file first using:
ExcelEngine excelEngine = new ExcelEngine();
ExcelExport exp = new ExcelExport();
IApplication application = excelEngine.Excel;
IWorkbook workbook = application.Workbooks.Create(1);
workbook = exp.Export(obj, data, "ResourceAssignment.xlsx", ExcelVersion.Excel2013, false, null, null);
IWorksheet sheet = workbook.Worksheets[0];
The workbook comes back as null, but the page is asking me to save the Excel file. It is exported and the code stops.
How do I get the workbook in to an object, so I can change the headers of the column?
Thanks
Eric