How to add security to excel file

Hi Amit,

Please find below link which will help you,

https://www.c-sharpcorner.com/blogs/protecting-excel-files-programmatically

https://stackoverflow.com/questions/915999/password-protecting-an-excel-file-in-c-sharp

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You can use a free library - free spire.xls(https://www.nuget.org/packages/FreeSpire.XLS/) to achieve this:

https://www.e-iceblue.com/Tutorials/Spire.XLS/Spire.XLS-Program-Guide/NET-Protect-Excel-Protect-Excel-Workbook-and-Worksheet.html

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https://stackoverflow.com/questions/915999/password-protecting-an-excel-file-in-c-sharp

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