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

using Syncfusion.XlsIO;
using System.IO;

Imports Syncfusion.XlsIO
Imports System.IO

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

// 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);
 
    // Access the 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();
 
    workbook.SaveAs(stream);
 
    // 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)
 
    'Access the 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
 
    workbook.SaveAs(stream)
 
    '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