Exemplo de uso de ViewModel

controller.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication6.Controllers
{
    public class HomeController : Controller
    {
        
        public ActionResult Index()
        {
            var noticiaVM = new NoticiaViewModel();
            //noticiaVM.Noticia = CarregaNoticia.FirstOrDefault();
            //noticiaVM.Comentarios = CarregaComentarios.Where(x => x.NoticiaId = noticiaVM.Noticia.NoticiaId).ToList();

            return View(noticiaVM);
        }

    }
    //CRIE AS CLASSES NO MESMO ARQUIVO DO CONTROLLER SO PRA FICAR MAIS FACIL ENTENDER
    public class NoticiaViewModel
    {
        public NoticiaViewModel()
        {
            Noticia = new Noticia();
            Comentarios = new Collection<Comentarios>();
        }
        public Noticia Noticia { get; set; }
        public ICollection<Comentarios> Comentarios { get; set; }
    }

    public class Noticia
    {
        public int NoticiaId { get; set; }
        public string Titulo { get; set; }
    }

    public class Comentarios
    {
        public int ComentarioId { get; set; }
        public string Comentario { get; set; }
        public int NoticiaId { get; set; }
    }

}

view.html

@model MvcApplication6.Controllers.NoticiaViewModel

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<fieldset>
    <legend>NoticiaViewModel</legend>
    
    @Model.Noticia.Titulo
    
    @foreach (var comentario in Model.Comentarios)
    {
        <p>@comentario.Comentario</p>
    }
</fieldset>
<p>
    @Html.ActionLink("Edit", "Edit", new { /* id=Model.PrimaryKey */ }) |
    @Html.ActionLink("Back to List", "Index")
</p>