How to read XLSB 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 and install 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.

Step 2: 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 3: Include EasyXLS library into project

EasyXLS.dll must be added as reference to your project. EasyXLS.dll can be found after installing EasyXLS, in "Dot NET version" folder.

Add EasyXLS reference

Step 4: Run C# code that reads XLSB file

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

/* ------------------------------------------------------------------------------
 * Tutorial 38
 * This tutorial shows how to read an Excel XLSB file in C# (the
 * XLSB file generated by Tutorial 29 as base template), modify
 * some data and save it to another XLSB file (Tutorial38 - read XLSB file.xlsb).
 * --------------------------------------------------------------------------- */

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

public class Tutorial38
    static void Main()
        Console.WriteLine("Tutorial 38\n-----------\n");

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

        // Read XLSB file
        Console.WriteLine("Reading file C:\\Samples\\Tutorial29.xlsb");

        if (workbook.easy_LoadXLSBFile("C:\\Samples\\Tutorial29.xlsb"))
            // 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 Tutorial38");

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

            // Export the new XLSB file
            Console.WriteLine("\nWriting file C:\\Samples\\Tutorial38 - read XLSB file.xlsb.");
            workbook.easy_WriteXLSBFile("C:\\Samples\\Tutorial38 - read XLSB file.xlsb");

            // 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\\Tutorial29.xlsb \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:

MS Excel 97 - 2003
MS Excel 2007 - 2010
MS Excel 2013
MS Excel 2016
MS Excel 2019