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Encryption can be performed on the workbook level, as shown below:
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//--- To encrypt a workbook, use the Workbook.EncryptPassword property:
ExcelApplication xlw = new ExcelApplication();
Workbook wb = xlw.Create();
wb.EncryptPassword = "myPassword";
xlw.Save(wb, outPath);
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How to Activate Worksheet Protection with ExcelWriter
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