IronXL, The Excel class library for .NET Framework, Core, and Standard, has full support for the XLSX file format, Microsofts most recent iteration of the Excel spreadsheet file format.

We can use C# to read XLS files using IronXL, and indeed import data from them, including live formula updating. IronXL can also be used to create XLSX files or convert old XLS files to XLSX files and vice versa. It can, in addition, import CSV, TSV, JSON, XML, and native class objects within C# to and from Excel workbooks.

Using IronXL and C# together, we can easily take any data within a C# application and export it to Excel so that it can be given to a user as a report or export it to another business system for its consumption.

IronXL differentiates itself by ease of installation using NuGet and its lack of dependency upon Microsoft Office being installed on the target machine. It is a pure C# solution for working with XLSX Excel files.

The IronXL library can be utilized to make and fare XLSX, XLS, CSV, TSV, JSON and XML records.

We can likewise fare to System.Data.DataSet and System.Data.DataTable items for interoperability with SQL

IronXL is an Excel Library for C# and .Net which allows developers to Read and edit Excel data from XLS and XLSX Documents without using Microsoft.Office.Interop.Excel.

The API allows us to Create, Read, Manipulate, Save and Export Excel files intuitively for:

.Net Framework 4.5+

.Net Core 2+

.Net Standard

Xamarin

Windows Mobile

Mono

& Azure Cloud hosting

It also fully supports ASP.Net, MVC, Windows, MacOS, Linux, iOS, Android and Windows Mobile application development.

With IronXL we can Read, Add, Sum, Average, Min, Max and Set Values over any Range of Cells.

You can find more about this at https://ironsoftware.com/csharp/excel/technology/read_xlsx-csharp/#convert-excel-spreadsheet

You can download the software at https://www.nuget.org/packages/IronXL.Excel