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Thank you for considering Aspose.
I tested your scenario with the attached latest version of Aspose.Cells and was unable to reproduce the issue. Please try the attached latest version and if you still face any problem, please share your template file here and we will check it soon.
Thank You & Best Regards,
Please try to change your line of code to:
worksheet1.Cells.ImportDataTable(dataTable, False, 1, 0, False)
The last boolean parameter should be False, so that no extra rows should be inserted based on the data in the data table.
Thank you very much!