Requirement: How to read data from XLS, XLSX or CSV files without the need for MS Excel?

My program needs to access data that is stored in a spreadsheet but I don't want to use MS Office Automation to open it. How can I open and read this file format?


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Reading data from XLS, XLSX or CSV files from .NET app with GemBox.Spreadsheet.
This example shows how to read data from XLS/XLSX/CSV files by using only GemBox.Spreadsheet (no need for Automation).
(C#.NET, VB.NET\.NET 2.0 Winforms)