Microsoft Excel is a widely used spreadsheet program for creating, manipulating, and analyzing data. However, to work with Excel files in C#, traditionally, you would need to install Microsoft Office or rely on third-party libraries. In this article, we will explore an alternative approach to generate Excel files (.XLS and .XLSX) using C# without the need for Office installation. We will leverage the EPPlus library, a powerful open-source library for working with Excel files in .NET.