Hi Manolo,
Thank you for contacting Syncfusion support.
In provided sample, the values of column header are changed in second worksheet of the workbook i.e. 2016. Please find the screen shots of code example and the generated excel file in the below table.
Code example |
Generated Excel file |
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As the sheet index in worksheet collection’s item is zero-based, the given code in the sample refers only the second sheet and so changes are reflected in it. If you are still facing this issue, please provide us your working Syncfusion assembly version along with machine culture information which will be helpful for us to provide you the prompt solution at the earliest.
Please let us know if you have any concerns.
Regards,
Dilli babu