Hi Pawel,
Thank you for using Syncfusion products.
1. Export decimal Column
We have tried the sample at hour side to export the decimail column and we could see the decimal values are exported correctly.
If u face the issue at your side, please use the following property for the same.
Code Snippet [C#]:
application.DecimalSeparator = ".";
Please try the sample attached here and let us know if these helps you.
2.Export string Column
Currently, we do not have support to export string column without doube-quote '"'. We have forwared to the development team for further analysis and we will get back to you with more details once we hear from them.
Please let me know if you require any further clarifications.
Thanks,
Sridhar.S
Xlsiosample_66eda3e5.zip