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How to create an Excel file in ASP.NET Core?

2 mins read

Syncfusion Essential XlsIO is a .NET Excel library used to create, read, and edit Excel documents. Using this library, you can start creating an Excel document in ASP.NET Core.


Steps to create Excel file programmatically:


  1. Create a new C# ASP.NET Core Web Application project.


Create ASP.NET Core web application in Visual Studio


  1. Select Web Application pattern (Model-View-Controller) for the project.


Select Web application(Model-View-Controller)


  1. Install the Syncfusion.XlsIO.Net.Core NuGet package as reference to your .NET Standard applications from


Add XlsIO reference to the project


  1. A default controller with named HomeController.cs gets added on creation of ASP.NET MVC project. Include the following namespaces in the HomeController.cs file.


using Syncfusion.XlsIO;
using System.IO;


Imports Syncfusion.XlsIO
Imports System.IO


  1. A default action method named Index will be present in HomeController.cs. Right click on Index method and select Go To View where you will be directed to its associated view page Index.cshtml.


  1. Add a new button in the Index.cshtml as shown below.


@{Html.BeginForm("CreateDocument", "Home", FormMethod.Get);
    <input type="submit" value="Create Document" style="width:150px;height:27px" />


  1. Add a new action method CreateDocument in HomeController.cs and include the below code snippet to create an Excel file and download it.


//Initialize ExcelEngine.
using (ExcelEngine excelEngine = new ExcelEngine())
    //Initialize Application.
    IApplication application = excelEngine.Excel;
    //Set default version for application.
    application.DefaultVersion = ExcelVersion.Excel2013;
    //Create a new workbook.
    IWorkbook workbook = application.Workbooks.Create(1);
    //Accessing first worksheet in the workbook.
    IWorksheet worksheet = workbook.Worksheets[0];
    //Adding text to a cell
    worksheet.Range["A1"].Text = "Hello World";
    //Saving the Excel to the MemoryStream 
    MemoryStream stream = new MemoryStream();
    //Set the position as '0'.
    stream.Position = 0;
    //Download the Excel file in the browser
    FileStreamResult fileStreamResult = new FileStreamResult(stream, "application/excel");
    fileStreamResult.FileDownloadName = "Output.xlsx";
    return fileStreamResult;


'Initialize ExcelEngine.
Using excelEngine As ExcelEngine = New ExcelEngine
    'Initialize Application.
    Dim application As IApplication = excelEngine.Excel
    'Set default version for application.
    application.DefaultVersion = ExcelVersion.Excel2013
    'Create a new workbook.
    Dim workbook As IWorkbook = application.Workbooks.Create(1)
    'Accessing first worksheet in the workbook.
    Dim worksheet As IWorksheet = workbook.Worksheets(0)
    'Adding text to a cell
    worksheet.Range("A1").Text = "Hello World"
    'Saving the Excel to the MemoryStream 
    Dim stream As MemoryStream = New MemoryStream
    'Set the position as '0'
    stream.Position = 0
    'Download the Excel file in the browser
    Dim fileStreamResult As FileStreamResult = New FileStreamResult(stream, "application/excel")
    fileStreamResult.FileDownloadName = "Output.xlsx"
    Return fileStreamResult
End Using


A complete working example of how to create an Excel file in ASP.NET Core can be downloaded from


By executing the program, you will get the Excel file as follows.

Create Excel File


Take a moment to peruse the documentation, where you can find basic worksheet data manipulation options along with features like Conditional Formatting, worksheet calculations through Formulas, adding Charts in worksheet or workbook, organizing and analyzing data through Tables and Pivot Tables, appending multiple records to worksheet using Template Markers, and most importantly PDF and Image conversions etc., with code examples.


Refer here to explore the rich set of Syncfusion Essential XlsIO features.


An online sample link to generate Excel file.


 Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.


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