EasyXLS

How to convert CSV file to Excel in C#.NET

EasyXLS Excel library can be used to convert 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 converts CSV file to Excel

Execute the following C# code that converts CSV file to Excel.

/* --------------------------------------------------------------------
 * Tutorial 39
 * 
 * This tutorial shows how to convert CSV file to Excel in C#. The
 * CSV file generated by Tutorial 30 is imported, some data is modified
 * and after that is exported as Excel file.
 * -------------------------------------------------------------------- */

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

public class Tutorial39
{
    [STAThread]
    static void Main()
    {
        Console.WriteLine("Tutorial 39\n-----------\n");

        // Create an instance of the class used to import/export Excel files
        ExcelDocument workbook = new ExcelDocument();

        // Import CSV file
        Console.WriteLine("Reading file C:\\Samples\\Tutorial30.csv");

        if (workbook.easy_LoadCSVFile("C:\\Samples\\Tutorial30.csv"))
        {
            // Set worksheet name
            workbook.easy_getSheetAt(0).setSheetName("First tab");

            // Add new worksheet and add some data in cells (optional step)
            workbook.easy_addWorksheet("Second tab");
            ExcelTable xlsTable = ((ExcelWorksheet)workbook.easy_getSheetAt(1)).easy_getExcelTable();
            xlsTable.easy_getCell("A1").setValue("Data added by Tutorial39");
            for (int column=0; column<5; column++)
            {
                xlsTable.easy_getCell(1, column).setValue("Data " + (column + 1));
            }

            // Export Excel file
            Console.WriteLine("\nWriting file C:\\Samples\\Tutorial39 - convert CSV to Excel.xlsx.");
            workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial39 - convert CSV to Excel.xlsx");

            // Confirm conversion of CSV to Excel
            String sError = workbook.easy_getError();
            if (sError.Equals(""))
                Console.Write("\nFile successfully created.");
            else
                Console.Write("\nError encountered: " + sError);
        }
        else
        {
            Console.WriteLine("\nError reading file C:\\Samples\\Tutorial30.csv \n" + workbook.easy_getError());
        }

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

        // Dispose memory
        workbook.Dispose();

        Console.ReadLine();
    }
}

EasyXLS Excel libraries:

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

File formats:

MS Excel 97 - 2003
MS Excel 2007 - 2019
MS Excel 2021
Office 365
XLSXXLSMXLSBXLS
XMLHTMLCSVTXT