In this article I will explain with an example, how to bind RadioButton (multiple RadioButtons) using Model in ASP.Net Core MVC.
The generic list collection of Model class will be populated from Database inside Controller and then it will be used to populate the list of multiple RadioButtons inside View in ASP.Net Core MVC.
 
 
 

Database

I have made use of the following table Customers with the schema as follow.
ASP.Net Core MVC: Binding RadioButton with Model
 
I have already inserted few records in the table.
ASP.Net Core MVC: Binding RadioButton with Model
 
Note: You can download the database table SQL by clicking the download link below.
            Download SQL file
 
 

Model

The Model class consists of the following properties.
public class Customer
{
    public string CustomerId { get; set; }
    public string Name { 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 and Entity Framework, please refer my article ASP.Net Core: Simple Entity Framework Tutorial with example. It covers all the information needed for connecting and configuring Entity Framework with ASP.Net Core.
 
using RadioButtonList_EF_MVC_Core.Models;
using Microsoft.EntityFrameworkCore;
 
namespace RadioButtonList_EF_MVC_Core
{
    public class DBCtx : DbContext
    {
        public DBCtx(DbContextOptions<DBCtx> options) : base(options)
        {
        }
 
        public DbSet<Customer> Customers { get; set; }
    }
}
 
 

Namespaces

You will need to import the following namespaces.
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
 
 

Controller

The Controller consists of following Action methods.

Action method for handling GET operation

Inside this Action method, the GetCustomers method is called.
Inside the GetCustomers method, the records are fetched from the Customers table using Entity Framework and are copied into Generic list of SelectListItem class and returned to the View.
 

Action method for handling POST operation

This Action method handles the call made from the POST function from the View when the Submit Button is clicked.
When the Form is submitted, the posted value is captured through the customer parameter which is also set as the Name of the HTML RadioButtons.
Then the GetCustomers method is called and the selected Customer is fetched using Lambda expression.
Finally, the Name of the selected Customer is set into a ViewBag object which will be later displayed in View using JavaScript Alert Message Box.
Note: For more details on displaying message using JavaScript Alert MessageBox, please refer my article ASP.Net MVC Core: Display Message from Controller in View using JavaScript Alert MessageBox.
 
public class HomeController : Controller
{
    private DBCtx Context { get; }
    public HomeController(DBCtx _context)
    {
        this.Context = _context;
    }
 
    public IActionResult Index()
    {
        return View(this.GetCustomers());
    }
 
    [HttpPost]
    public IActionResult Index(string customer)
    {
        var selectedCustomer = this.GetCustomers().Find(p => p.Value == customer);
        if (selectedCustomer != null)
        {
            selectedCustomer.Selected = true;
             ViewBag.Message = "Selected Customer: " + selectedCustomer.Text;
        }
 
        return View(this.GetCustomers());
    }
 
    private List<SelectListItem> GetCustomers()
    {
        List<SelectListItem> customerList = (from p in this.Context.Customers
                                             select new SelectListItem
                                             {
                                                  Text = p.Name,
                                                  Value = p.CustomerId.ToString()
                                             }).ToList();
 
        return customerList;
    }
}
 
 

View

HTML Markup

Inside the View, in the very first line the generic list of SelectListItem class is declared as model for the View.
The View consists of an HTML Form with following ASP.Net Tag Helpers attributes and a Submit Button.
asp-action – Name of the Action. In this case the name is Index.
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.
Inside the Form, ForEach Loop is executed over the generic List of SelectListItem class which in turn generates a list containing a group of HTML Label elements and HTML RadioButtons.
Note: The RadioButtons are grouped by keeping the Name attribute value constant for all RadioButtons.
 
When the Submit Button is clicked, the Form gets submitted and the value of the selected RadioButton is sent to the Controller.
Finally, the selected Customer name is displayed using JavaScript Alert Message Box.
@using RadioButtonList_EF_MVC_Core.Models;
@addTagHelper*, Microsoft.AspNetCore.Mvc.TagHelpers
@model List<SelectListItem>
 
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <form method="post" asp-controller="Home" asp-action="Index">
        @foreach (var customer in Model)
        {
            <input id="@customer.Value" type="radio" name="Customer" value="@customer.Value" />
            <label for="@customer.Value">@customer.Text</label>
            <br />
        }
        <br />
        <input type="submit" value="Submit" />
    </form>
    @if (ViewBag.Message != null)
    {
        <script type="text/javascript">
            window.onload = function() {
                alert("@ViewBag.Message");
            };
        </script>
    }
</body>
</html>
 
 

Screenshot

ASP.Net Core MVC: Binding RadioButton with Model
 
 

Downloads

RadioButtonList_EF_MVC_Core.zip