Read XLS, XLSX, CSV from C# in your ASP.NET applications. Bytescout Spreadsheet SDK is a clean and simple API to read XLS, XLSX, CSV files from C# (C Sharp). Reading data from XLS and other Excel files is the ability needed in almost every business application. Using Bytescout Spreadsheet SDK is a simple way of reading Excel files using C# even without MS Excel installed. With the Spreadsheet SDK, you can read XLS, XSLX, CSV, ODS [...]