Comment.cshtml

@inherits System.Web.Mvc.WebViewPage<UserGroup.Models.CommentPage>
@using System.Web.Mvc.Html
@using Sitecore.Mvc
@using Sitecore.Mvc.Contrib.Html;

@Html.Sitecore().Placeholder("webedit")
<div>
    <h3>Comments</h3>
    @if (Model.CommentAdded)
    {
        <div>
            Your comment has been submitted and is awaiting approval
        </div>  
    }
    
    <div>
        @Html.ValidationSummary("Comment Errors")
        <h4>Add Comment</h4>
        @using (Html.BeginForm())
        {
            <p>
                @Html.ValidationMessage("FullName")
                @Html.ScLabelFor(x=>x.Comment.Content)
                @Html.TextBox("FullName")
            </p>
            <p>
                @Html.ValidationMessage("Email")
                @Html.Label("Email", "Email")
                @Html.TextBox("Email")
            </p>
            <p>
                @Html.ValidationMessage("Content")
                @Html.LabelFor(x=>x.Comment.Content)
                @Html.TextArea("Content")
            </p>
            
            
            <input type="submit" value="Add" name="addComment" />
        }
    </div>
    <div>
        <h2>Comment Item</h2>
        @Html.ScLabelFor(x=>x.CommentItem.Content)
        @Html.ScLabelFor(x=>x.CommentItem.Email )
        @Html.LabelFor(x=>x.CommentItem.FullName)
    </div>
    <div>
        @if (Model.CommentFolder != null && Model.CommentFolder.Comments.Any())
        {
            <ul>
                @foreach (var comment in Model.CommentFolder.Comments)
                {
                    <li>
                        From: <span class="Author">@comment.FullName</span>
                        <p>
                            @comment.Content
                        </p>                
                    </li>
                }
            </ul>
        }
        else
        {
            <p>Be the first to comment</p>
        }

    
    </div>
</div>

CommentController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Sitecore.Mvc.Controllers;
using Glass.Sitecore.Mapper;
using Sitecore.SecurityModel;
using System.Web.UI.WebControls;
using Sitecore.Mvc.Presentation;
using UserGroup.Models;

namespace UserGroup.Controllers
{
    public class CommentController  : SitecoreController
    {
        ISitecoreContext _context;
        ISitecoreService _master;
        
        /// <summary>
        /// This constructor can be used with dependency injection or unit testing 
        /// </summary>
        /// <param name="context"></param>
        public CommentController(ISitecoreContext context, ISitecoreService master) 
        {
            _context = context;
            _master = master;
        }

        [HttpGet]
        public override ActionResult Index()
        {

            var model = _context.CreateClass<CommentPage>(false, false, PageContext.Current.Item);
            return View(model);
        }

        [HttpPost]
        public ActionResult Index(Comment comment)
        {
            


            var webModel = _context.CreateClass<CommentPage>(false, false, PageContext.Current.Item);

            if (ModelState.IsValid && comment != null)
            {
                var masterModel = _master.GetItem<CommentPage>(webModel.Id);

                if (masterModel.CommentFolder == null)
                {
                    CommentFolder folder = new CommentFolder();
                    folder.Name = "Comments";

                    using (new SecurityDisabler())
                    {
                        _context.Create(masterModel, folder);
                    }
                    masterModel.CommentFolder = folder;
                }

                using (new SecurityDisabler())
                {
                    comment.Name = DateTime.Now.ToString("yyyyMMddhhmmss");

                    //create the comment in the master database
                    _master.Create(masterModel.CommentFolder, comment);
                    webModel.CommentAdded = true;
                }
            }

           
            return View(webModel);
        }
    }

}