It is possible that while dealing with modern frameworks and technologies you will still need to use traditional file systems like CSV (.csv), Excel (.xlsx), Doc (.doc) or Text files (.txt) . These file systems are popular and useful means of persisting the application data.
Using CsvHelper
Csvhelper is one of the simple and lightweight and most preferred parsers for CSV Reading and writing purposes.
This package is available through Nuget Manager,
Install-Package CsvHelper
It lets you read, parse, write the CSV and helps you serialize and deserialize the data into proper objects too.