Razor Pages offer a modern approach to building web pages. In Razor Pages, the source code that renders the web page is written in C# rather than being generated by a server-side page.

To efficiently work with Excel files, the IronXL library is recommended over others like the POI Java project NPOI package (notably used with PowerPoint files) and Office Interop. IronXL is a feature-rich, easy-to-use library that doesn't require Microsoft Office and supports multiple .NET versions.

This article demonstrates using the IronXL C# library to generate and export Excel spreadsheets with dummy data and row headers in Razor Pages.

IronXL: C# Excel Library

IronXL is a C# Excel library that offers methods and functions for operating on large data sets using parallel processing to increase computing power. It's user-friendly as it doesn't require understanding the inner workings and supports both XLS and XLSX files.

IronXL is ideal for importing, exporting, creating Excel formulas, and office documents without needing Microsoft Office to be installed.

Learn how to import and export Excel files in Razor Pages using IronXL.

Generate Excel File in Razor Pages

To create Excel sheets in Razor Pages, start by opening Visual Studio, creating an ASP.NET Core Web Application, and installing IronXL.

Prerequisites

Setting up to create Excel files in Razor Pages requires:

1. Visual Studio (Latest Version)
2. .NET Framework 6 or 7
3. .NET Core Web Application in Visual Studio

Install IronXL Library

Install IronXL using the NuGet Package Manager Console. Enter this command to install the library in a .NET Core Web Application:

Install-Package IronXL.Excel

Code for Generating Excel file

Here's how to write the code. Open "Index.cs" in the Pages folder and add the following method:

public FileResult OnPostExport()
{
    // Create a new WorkBook with XLSX format
    WorkBook workBook = new WorkBook(IronXL.ExcelFileFormat.XLSX);
    // Create a new WorkSheet named "data"
    WorkSheet workSheet = workBook.CreateWorkSheet("data");

    // Add headers to the new worksheet
    workSheet["A1"].Value = "Product EN";
    workSheet["B1"].Value = "SKU";
    workSheet["C1"].Value = "Customer";

    // Make header text bold
    workSheet["A1:C1"].Style.Font.Bold = true;

    // Add dummy data to the worksheet
    workSheet["A2"].Value = "Iron Rods";
    workSheet["A3"].Value = "Mobile Phones";
    workSheet["A4"].Value = "Chargers";

    workSheet["B2"].Value = "105";
    workSheet["B3"].Value = "285";
    workSheet["B4"].Value = "301";

    workSheet["C2"].Value = "Adam";
    workSheet["C3"].Value = "Ellen";
    workSheet["C4"].Value = "Tom";

    // Convert the WorkBook to a byte array Stream for download
    return File(workBook.ToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx");
}

public FileResult OnPostExport()
{
    // Create a new WorkBook with XLSX format
    WorkBook workBook = new WorkBook(IronXL.ExcelFileFormat.XLSX);
    // Create a new WorkSheet named "data"
    WorkSheet workSheet = workBook.CreateWorkSheet("data");

    // Add headers to the new worksheet
    workSheet["A1"].Value = "Product EN";
    workSheet["B1"].Value = "SKU";
    workSheet["C1"].Value = "Customer";

    // Make header text bold
    workSheet["A1:C1"].Style.Font.Bold = true;

    // Add dummy data to the worksheet
    workSheet["A2"].Value = "Iron Rods";
    workSheet["A3"].Value = "Mobile Phones";
    workSheet["A4"].Value = "Chargers";

    workSheet["B2"].Value = "105";
    workSheet["B3"].Value = "285";
    workSheet["B4"].Value = "301";

    workSheet["C2"].Value = "Adam";
    workSheet["C3"].Value = "Ellen";
    workSheet["C4"].Value = "Tom";

    // Convert the WorkBook to a byte array Stream for download
    return File(workBook.ToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx");
}

Public Function OnPostExport() As FileResult
	' Create a new WorkBook with XLSX format
	Dim workBook As New WorkBook(IronXL.ExcelFileFormat.XLSX)
	' Create a new WorkSheet named "data"
	Dim workSheet As WorkSheet = workBook.CreateWorkSheet("data")

	' Add headers to the new worksheet
	workSheet("A1").Value = "Product EN"
	workSheet("B1").Value = "SKU"
	workSheet("C1").Value = "Customer"

	' Make header text bold
	workSheet("A1:C1").Style.Font.Bold = True

	' Add dummy data to the worksheet
	workSheet("A2").Value = "Iron Rods"
	workSheet("A3").Value = "Mobile Phones"
	workSheet("A4").Value = "Chargers"

	workSheet("B2").Value = "105"
	workSheet("B3").Value = "285"
	workSheet("B4").Value = "301"

	workSheet("C2").Value = "Adam"
	workSheet("C3").Value = "Ellen"
	workSheet("C4").Value = "Tom"

	' Convert the WorkBook to a byte array Stream for download
	Return File(workBook.ToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx")
End Function

Public Function OnPostExport() As FileResult
	' Create a new WorkBook with XLSX format
	Dim workBook As New WorkBook(IronXL.ExcelFileFormat.XLSX)
	' Create a new WorkSheet named "data"
	Dim workSheet As WorkSheet = workBook.CreateWorkSheet("data")

	' Add headers to the new worksheet
	workSheet("A1").Value = "Product EN"
	workSheet("B1").Value = "SKU"
	workSheet("C1").Value = "Customer"

	' Make header text bold
	workSheet("A1:C1").Style.Font.Bold = True

	' Add dummy data to the worksheet
	workSheet("A2").Value = "Iron Rods"
	workSheet("A3").Value = "Mobile Phones"
	workSheet("A4").Value = "Chargers"

	workSheet("B2").Value = "105"
	workSheet("B3").Value = "285"
	workSheet("B4").Value = "301"

	workSheet("C2").Value = "Adam"
	workSheet("C3").Value = "Ellen"
	workSheet("C4").Value = "Tom"

	' Convert the WorkBook to a byte array Stream for download
	Return File(workBook.ToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Grid.xlsx")
End Function

In this code, a new Excel WorkBook is created and contains one WorkSheet. The sheet is populated with dummy data, and the generated file is responded to the server with:

• The WorkBook is converted to a Stream to download as a file.
• The MIME type is set.
• A name for the file download is specified.

Create a button to download the Excel file

Replace the existing code in "Index.cshtml" with the following:

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}

<div class="text-center">
    <h1 class="display-4">IronXL Generate Excel File</h1>
    <p class="m-5">IronXL is an Excel Library for C# that allows developers to read and edit Excel data from XLS and XLSX documents without using Microsoft.Office.Interop.Excel</p>
    <form method="post" asp-page-handler="Export">
        <button class="btn btn-success p-3">Generate Excel File!</button>
    </form>
</div>

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}

<div class="text-center">
    <h1 class="display-4">IronXL Generate Excel File</h1>
    <p class="m-5">IronXL is an Excel Library for C# that allows developers to read and edit Excel data from XLS and XLSX documents without using Microsoft.Office.Interop.Excel</p>
    <form method="post" asp-page-handler="Export">
        <button class="btn btn-success p-3">Generate Excel File!</button>
    </form>
</div>

This HTML creates a form with asp-page-handler set to "Export", enabling the application to export the Excel file to the local machine when the user clicks the "Generate Excel File!" button, triggering a browser download.

Run the Project

Run the project, and you'll see a screen in the browser. Click the green button to download the Excel file.

IronXL Generate Excel Sheets

After clicking "Generate Excel File!", the file will download.

IronXL Downloaded File

Open the Generated Excel File

The generated Excel file's content matches the code's output with perfect formatting. The snapshot of the generated Excel file is displayed below.

IronXL Generated File

IronXL better than Competitors

IronXL is a superior tool for working with both XLS and XLSX formats without limitations like NPOI, which is slower due to being Java-based, whereas IronXL is C#. In ASP.NET Core applications generating large/multiple spreadsheets, opt for IronXL over POI.

IronXL allows for creating and editing Excel files without Microsoft Office. Unlike Microsoft Interop, IronXL does not need to call Microsoft Excel's ActiveX for Excel operations or exports. It also allows exporting CSV files to Excel format.

IronXL also provides extensive features for interacting with Excel files, including converting between popular formats, inserting math functions, adding charts, and inserting images.

Conclusion

This article showcases using IronXL for generating an Excel file in Razor Pages without needing Microsoft Excel ActiveX and facilitating file downloads.

Explore more tutorials on creating Excel files.

IronXL is free for non-commercial development. A free trial is available for production testing. View pricing plans for more pricing and licensing details.