How to export DataSet to Excel in custom format 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: 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 exports DataSet to Excel with formatting

Execute the following C# code that exports DataSet to Excel with formatting.

/* -----------------------------------------------------------------------
 * Tutorial 02
 * This code sample shows how to export DataSet to Excel file in C#. 
 * The DataSet contains data from a SQL database, but it also can contain
 * data from other sources like GridView, DataGridView, DataGrid or other.
 * The cells are formatted using a user-defined format.
 * -------------------------------------------------------------------- */

using System;
using System.IO;
using System.Data;
using System.Drawing;
using EasyXLS;
using EasyXLS.Constants;

public class Tutorial02
    static void Main()
        Console.WriteLine("Tutorial 02\n-----------\n");

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

        // Create the database connection
        String sConnectionString = "Initial Catalog=Northwind;Data Source=localhost;Integrated Security=SSPI;";
        System.Data.SqlClient.SqlConnection sqlConnection =
                              new System.Data.SqlClient.SqlConnection(sConnectionString);

        // Create the adapter used to fill the dataset
        String sQueryString = "SELECT TOP 100 CAST(Month(ord.OrderDate) AS varchar) + " +
                              "'/' + CAST(Day(ord.OrderDate) AS varchar) + " + 
                              "'/' + CAST(year(ord.OrderDate) AS varchar) AS 'Order Date', " +
                              "P.ProductName AS 'Product Name', O.UnitPrice AS Price, " +
                              "CAST(O.Quantity AS varchar) AS Quantity, O.UnitPrice * O. Quantity AS Value " +
                              "FROM Orders AS ord, [Order Details] AS O, Products AS P " +
                              "WHERE O.ProductID = P.ProductID AND O.OrderID = ord.OrderID";
        System.Data.SqlClient.SqlDataAdapter adp = 
                              new System.Data.SqlClient.SqlDataAdapter(sQueryString, sqlConnection);

        // Populate the dataset
    	DataSet ds  = new DataSet();

        // Create an instance of the class used to format the cells in the report
        ExcelAutoFormat xlsAutoFormat = new ExcelAutoFormat();
        // Set the formatting style of the header
        ExcelStyle xlsHeaderStyle = new ExcelStyle(Color.LightGreen);

        // Set the formatting style of the cells (alternating style)
        ExcelStyle xlsEvenRowStripesStyle = new ExcelStyle(Color.FloralWhite);
        ExcelStyle xlsOddRowStripesStyle = new ExcelStyle(Color.FromArgb(240, 247, 239));
        ExcelStyle xlsLeftColumnStyle = new ExcelStyle(Color.FloralWhite);
        // Export the Excel file
        Console.WriteLine("Writing file C:\\Samples\\Tutorial02 - export DataSet to Excel with formatting.xlsx.");
           "C:\\Samples\\Tutorial02 - export DataSet to Excel with formatting.xlsx", ds, xlsAutoFormat, "Sheet1");

        // 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...");

    	// Close the database connection

        // 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
Express Excel Writer for C#
limited .NET version to create and export Excel files in predefined formats
Download EasyXLS™ Excel Library for C#

File formats:

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