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Editorial Team
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Asked: 2026-06-06T13:20:56+00:00

Hello I have a WinForm app that generates a ton of data. Currently I

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Hello I have a WinForm app that generates a ton of data. Currently I have this savable and open-able in an Excel .xls file format. However I’d like to move away from this so that the user can’t open the file up in Excel and modify the contents freely.

The solution I’ve come up with is encoding this as a new file type, example as an “.por” file. However I also don’t want this to be a simple rename of the extension so that a user could rename back to .xls and being editing. How can I do this?

Furthermore I’m programmitically taking a DataTable and row by row writing this out to the Excel file. Would it help to save the DataTable contents using a different method (not SQL)?

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  1. Editorial Team

    A simple way to do this would be to put your DataTable into a DataSet, call the DataSet‘s WriteXml(...) method (which will save your data in XML format to a file) and then encrypt the file using File.Encrypt.

    To read from a file, you reverse the process, using File.Decrypt to turn the file back into a plain-XML file, and then load it into a DataSet using the DataSet’s ReadXml(...) method.

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