How to read XLSX file in C#.NET

EasyXLS Excel library can be used to import Excel files in C#. The library works with .NET Framework or .NET Core platform.

Step 1: Download EasyXLS Excel Library for .NET

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for C#

If you already own a license key, you may login and download EasyXLS from your account.

Install the downloaded EasyXLS installer for v8.6 or earlier.

Step 2: License file setup

Step required for EasyXLS v9.0 or later.

If you are using a trial, generate a trial license file from EasyXLS trials page. The trial license is valid for 30-days.

If you own a license key, you may login to the account that purchased the license and generate the license file from:

Setup the license file into your project using these guidelines.

Step 3: Create a C# project

If don't have a project, create one as ASP.NET web application, windows forms app, console application, class library or service.

Step 4: Include EasyXLS library into project

EasyXLS.dll must be added as reference to your project. EasyXLS.dll can be found:
- Inside the downloaded archive at Step 1 for EasyXLS v9.0 or later
- Under installation path for EasyXLS v8.6 or earlier, in "Dot NET version" folder.

Add EasyXLS reference

Step 5: Run C# code that reads XLSX file

Execute the following C# code that imports an XLSX file.

/* ------------------------------------------------------------------------------
 * Tutorial 36
 * This tutorial shows how to read an Excel XLSX file in C# (the
 * XLSX file generated by Tutorial 04 as base template), modify
 * some data and save it to another XLSX file (Tutorial36 - read XLSX file.xlsx).
 * --------------------------------------------------------------------------- */

using System;
using System.IO;
using System.Data;
using EasyXLS;

public class Tutorial36
    static void Main()
        Console.WriteLine("Tutorial 36\n-----------\n");

        // Create an instance of the class that reads Excel files
        ExcelDocument workbook = new ExcelDocument();

        // Read XLSX file
        Console.WriteLine("Reading file C:\\Samples\\Tutorial04.xlsx");

        if (workbook.easy_LoadXLSXFile("C:\\Samples\\Tutorial04.xlsx"))
            // Get the table of data for the second worksheet
            ExcelTable xlsSecondTable = 
                ((ExcelWorksheet)workbook.easy_getSheet("Second tab")).easy_getExcelTable();

            // Write some data to the second sheet
            xlsSecondTable.easy_getCell("A1").setValue("Data added by Tutorial36");

            for (int column=0; column<5; column++)
                xlsSecondTable.easy_getCell(1, column).setValue("Data " + (column + 1)); 

            // Export the new XLSX file
            Console.WriteLine("\nWriting file C:\\Samples\\Tutorial36 - read XLSX file.xlsx.");
            workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial36 - read XLSX file.xlsx");

            // Confirm export of Excel file
            String sError = workbook.easy_getError();
            if (sError.Equals(""))
                Console.Write("\nFile successfully created.");
                Console.Write("\nError encountered: " + sError);
            Console.WriteLine("\nError reading file C:\\Samples\\Tutorial04.xlsx \n" + workbook.easy_getError());

        Console.WriteLine("\nPress Enter to exit ...");

        // Dispose memory


EasyXLS Excel libraries:

Excel Library for C#
full .NET version to import, export or convert Excel files
Excel Reader for C#
.NET version to read and import Excel files
Download EasyXLS™ Excel Library for C#

File formats:

Office 365
MS Excel 2021 - 2024
MS Excel 2007 - 2019
MS Excel 97 - 2003