NPOI - This project is the .NET version of POI Java project at https://poi.apache.org/. EPPlus - EPPlus is a .NET library that reads and writes Excel 2007/2010 files using the Open Office XML format (xlsx). Open
Here is one approach to solving this problem using the map-reduce technique. If you are not familiar with map-reduce and functional programming in Java then I highly recommend you to joinLearn Java Functional Programming with Lambdas & Streamscourseon Udemy. It's a great course to learn essent...