How to add formulas in cells in C#.NET

EasyXLS Excel library can be used to export 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: 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:
- 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 4: Run C# code that adds formula to Excel cell

Execute the following C# code that exports an Excel file with formulas.

/* ----------------------------------------------------------
 * Tutorial 11
 * This tutorial shows how to create an Excel file in C# that
 * has a cell that contains SUM formula for a range of cells.
 * ------------------------------------------------------- */

using System;
using EasyXLS;

public class Tutorial11
    static void Main()
        Console.WriteLine("Tutorial 11\n----------\n");

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

        // Get the table of data for the sheet, add data in sheet and the formula
        ExcelTable xlsTable = ((ExcelWorksheet)workbook.easy_getSheet("Formula")).easy_getExcelTable();

        // Export Excel file
        Console.WriteLine("Writing file C:\\Samples\\Tutorial11 - formulas in Excel.xlsx.");
        workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial11 - formulas in Excel.xlsx");

        // Confirm export of Excel file
        String sError = workbook.easy_getError();
        if (sError.Equals(""))
            Console.Write("\nFile successfully created. Press Enter to Exit...");
            Console.Write("\nError encountered: " + sError + "\nPress Enter to Exit...");

        // Dispose memory


EasyXLS Excel libraries:

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

File formats:

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