1. In MVC3 Razor we have HTML helpers to render different controls. 
2. Instead of using these helpers we can create our own helper classes and methods and use them as we want.
3. The creation of custom helpers provides flexibility to change the attributes and style of the control that renders.
4. In this article we will create Custom HTML helper for Radio Button with Model Binding to render radio buttons.

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Web;
using System.Web.Mvc;
using System.Text;

namespace CustomHtmlHelpers.CustomHelpers
{
    public static class CustomRadioButtonHelperModelBinding
    {
        public static MvcHtmlString CustomRadioButtonFor<TModel,TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel,TValue>> expression)
        {

            //Fetching the metadata related to expression. This includes property name, model value etc.
            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, helper.ViewData);
            string htmlFieldName = ExpressionHelper.GetExpressionText(expression);
            //Fetching the property name from metadata object.
            string propertyName = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName;

            //Created a StringBuilder object to hold the html markup as string.
            StringBuilder radiobutton = new StringBuilder();
            TagBuilder radio = null;
            TagBuilder label = null;
            //Iterating over list from model.
            foreach (SelectListItem item in (IEnumerable<SelectListItem>)metadata.Model)
            {
                //Creating new radio control for each item in list.
                radio = new TagBuilder("input");
                //Creating new label control for each item in list.
                label = new TagBuilder("label");
                label.InnerHtml = item.Text;
                //Setting the input type to radio to render radio button.
                radio.Attributes.Add("type", "radio");
                radio.Attributes.Add("name", propertyName);
                radio.Attributes.Add("value", item.Text);
                //appending the label string to string builder object.
                radiobutton.Append(label.ToString());
                //appending the radio string to string builder object.
                radiobutton.Append(radio.ToString());
            }
            return MvcHtmlString.Create(radiobutton.ToString());
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
using System.ComponentModel.DataAnnotations;


namespace CustomHtmlHelpers.Models
{
    public class Register
    {
        public List<selectlistitem> players { get; set; }
    }
}