Hi Simon Finch,
Thank you for choosing Syncfusion products.
XlsIO provides support for reading and writing CSV files. The following code example illustrates how to open a .csv file with “,” as a delimiter.
// Opening a CSV File.
IWorkbook workbook = application.Workbooks.Open("CSVfile.csv", ",");
Please refer the below online documentation link for more information
Please let us know if you require any further clarifications.
Regards,
Manojkumar.