In this article I will explain with an example, how to export WebGrid to CSV (Text) file in ASP.Net Core (.Net Core 8) MVC.
The WebGrid will be populated from database using Entity Framework and then the records from the database will be exported and downloaded as Microsoft CSV (Text) file in ASP.Net Core (.Net Core 8) MVC.
Note: For more details on ASP.Net Core (.Net Core 8) MVC, please refer my article ASP.Net Core 8: Hello World Tutorial with Sample Program example: Hello World Tutorial with Sample Program example.
 
 

MVC6 Grid for ASP.Net Core

This article makes use of MVC6 Grid library for implementing WebGrid, as it is not available by default in .Net Core.
Note: For more details on how to use MVC6 Grid, please refer my article WebGrid Step By Step Tutorial with example in ASP.Net Core MVC.
 
 

Database

Here I am making use of Microsoft’s Northwind Database. You can download it from here.
Download and install Northwind Database
 
 

Model

The Model class consists of the following properties.
public class Customer
{
    public string CustomerID { get; set; }
    public string ContactName {  get; set; }
    public string City { get; set; }
    public string Country { get; set; }
}
 
 

Database Context

Once the Entity Framework is configured and connected to the database table, the Database Context will look as shown below.
Note: For beginners in ASP.Net Core (.Net Core 8) MVC and Entity Framework, please refer my article ASP.Net Core 8: Hello World Tutorial with Sample Program example. It covers all the information needed for connecting and configuring Entity Framework with ASP.Net Core (.Net Core 8) MVC.
 
using Microsoft.EntityFrameworkCore;
 
namespace Export_WebGrid_CSV_MVC_Core
{
    public class DBCtx : DbContext
    {
        public DBCtx(DbContextOptions<DBCtx> options) : base(options)
        {
        }
 
        public DbSet<Customer> Customers { get; set; }
    }
}
 
 

Namespaces

You need to import the following namespace.
using System.Text;
 
 

Controller

The Controller consists of following Action methods.

Action method for handling GET operation

Inside this Action method, the Top 10 records are fetched from the Customers table using Entity Framework and returned to the View.
 

Action method for handling the CSV (Text) files Export and Download operation

This Action method is executed when the Export Button is clicked.
Note: The following Action method performs File Download operation. Hence the return type is set to FileResult.
 
Inside this Action method, the Top 10 records are fetched from the Customers table using Entity Framework.
Then, a FOREACH loop is executed over the records fetched using Entity Framework and a comma separated (delimited) string is generated which is ultimately converted to a BYTE Array using the GetBytes method of Encoding class.
Finally, the BYTE Array is exported and downloaded as CSV (Text) file using the File method which accepts type and name of the CSV (Text) file to be downloaded.
public class HomeController : Controller
{
    private DBCtx Context{ get; }
    public HomeController(DBCtx _context)
    {
        this.Context = _context;
    }
 
    public IActionResult Index()
    {
        return View(this.Context.Customers.Take(10).ToList());
    }
 
    [HttpPost]
    public FileResult Export()
    {
        string[] columnNames = new string[] {"CustomerId", "ContactName", "City", "Country" };
        var customers = this.Context.Customers.Take(10).ToList();
 
        //Build the CSV file data as a Comma separated string.
        string csv = string.Empty;
 
        foreach (string columnName in columnNames)
        {
            //Add the Header row for CSV file.
             csv += columnName + ',';
        }
 
        //Add new line.
         csv += "\r\n";
 
        foreach (var customer in customers)
        {
            //Add the Data rows.
             csv += customer.CustomerID.Replace(",", ";") + ',';
             csv += customer.ContactName.Replace(",", ";") + ',';
             csv += customer.City.Replace(",", ";") + ',';
             csv += customer.Country.Replace(",", ";") + ',';
 
            //Add new line.
             csv += "\r\n";
        }
 
        //Download the CSV file.
        byte[] bytes = Encoding.ASCII.GetBytes(csv);
        return File(bytes, "text/csv", "Grid.csv");
    }
}
 
 

View

HTML Markup

Inside the View, in the very first line the Customer Model is declared as IEnumerable which specifies that it will be available as a collection.
The ASP.Net TagHelpers, NonFactors.Mvc.Grid namespaces are inherited.
Then, the following CSS file is inherited.
1. mvc-grid.css
 

Displaying the records

For displaying the records, MVC6 Grid is used.
The IEnumerable collection of Customer Model class object is passed to the Grid function of the MVC6 Grid HTML Helper class.
 

Exporting MVC6 Grid to CSV (Text) file

Below the MVC6 Grid, there is an HTML Form created with following ASP.Net TagHelpers attributes.
asp-action - Name of the Action. In this case the name is Export.
asp-controller - Name of the Controller. In this case the name is Home.
method - It specifies the Form Method i.e. GET or POST. In this case it will be set to POST.
The Form consists of a Submit Button.
When the Export Button is clicked, the MVC6 Grid data will be exported and downloaded as CSV (Text) file.
@model IEnumerable<Export_WebGrid_CSV_MVC_Core.Models.Customer>
@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@using NonFactors.Mvc.Grid;
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <link href="~/css/mvc-grid/mvc-grid.css" rel="stylesheet" />
</head>
<body>
    <div id="Grid" style="width: 500px">
        <h4>Customers</h4>
        <hr />
        @(Html.Grid(Model).Build(columns =>
                {
                    columns.Add(model => model.CustomerID).Titled("CustomerID");
                    columns.Add(model => model.ContactName).Titled("ContactName");
                    columns.Add(model => model.City).Titled("City");
                    columns.Add(model => model.Country).Titled("Country");
                })
                )
    </div>
    <br />
    <br />
    <form method="post" asp-action="Export" asp-controller="Home">
        <input type="submit" id="btnSubmit" value="Export" />
    </form>
</body>
</html>
 
 

Screenshots

WebGrid

ASP.Net Core: Export WebGrid to CSV (Text) file
 

Exported CSV (Text) file

ASP.Net Core: Export WebGrid to CSV (Text) file
 
 

Downloads

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