Hi Farshad,
Thank you contacting Syncfusion support.
The DataTable does not exist in UWP. Hence it cannot be achieved in XlsIO. However, you can achieve your requirement by referring .NET core NuGet packages in your UWP application to perform export data.
To know about export data in .Net Core, please find the following UG link.
Note: To use .NET Core NuGet packages in your UWP application, please install Windows 10 Fall Creators Update in your production machine.
Regards,
Prakash Kumar