[TableName("Categories")]
[PrimaryKey("Id", autoIncrement = true)]
public class Category : BaseModel
{
    public int Id { get; set; }
    public string Name { get; set; }

    public List<Category> lstCategory;

    public Category()
    {
        lstCategory = new List<Category>();
    }
}

@using SampleLogic
@using SampleLogic.Models
@inherits UmbracoTemplatePage
@{
    Layout = "umbLayout.cshtml";
    var repo = new CategoryRepository();
}

    <div id="main-wrapper">
        <div id="main" class="container">
            <div class="row">
                <div class="9u skel-cell-mainContent">
                    <div class="content content-left">
                        @*@Umbraco.RenderMacro("facebookConnect", new {RedirectUrl="2105", HideLoginBox="0"})*@
                        @*@Html.Partial("AddCategory" , new Category())*@
                        @Html.Action("AddCategory", "SampleSurface")
                        @foreach (var category in repo.GetAll())
                        {
                            <div class="row-fluid">
                                <div class="span12">
                                    <p>@category.Name
                                    @Html.ActionLink("Edit", "Sample", "Sample", new { id = @category.Id }, null) <a href="?id=@category.Id">Edit</a></p>
                                    <p>.........................</p>
                                </div>
                            </div>
                        }
                        <!-- Content -->
                    </div>
                </div>
            </div>
        </div>
    </div>

using SampleLogic.Models;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Umbraco.Core.Models;
using Umbraco.Web;
using Umbraco.Web.Models;
using Umbraco.Web.Mvc;

namespace SampleLogic.Controllers
{
    public class SampleController : RenderMvcController
    {
        public ActionResult Sample(int id = 0)
        {
            Category model = new Category();
            var repo = new CategoryRepository();

            if (Request.QueryString["id"] != null)
            {
                model.Name = repo.GetCategoryById(Convert.ToInt32(Request.QueryString["id"])).Name;
            }

            model.lstCategory = repo.GetAll();
            return CurrentTemplate(model);
        }

    }
}

using SampleLogic.Models;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Umbraco.Core.Models;
using Umbraco.Web;
using Umbraco.Web.Mvc;

namespace SampleLogic.Controllers
{
    public class SampleSurfaceController : SurfaceController
    {
        [HttpPost]
        public ActionResult Sample(Category model)
        {
            var repo = new CategoryRepository();
            if (model.Id > 0)
            {
                repo.Update(model);
            }
            else
            {
                repo.Insert(model);
            }
            model.Name = string.Empty;
            return CurrentUmbracoPage();
        }

        [ChildActionOnly]
        public ActionResult AddCategory(Category model)
        {
            if (Request.QueryString["id"] != null)
            {
                var repo = new CategoryRepository();
                model.Name = repo.GetCategoryById(Convert.ToInt32(Request.QueryString["id"])).Name;
            }
            //TODO: do some searching (perhaps using Examine)
            //using the information contained in the custom class QueryParameters

            //return the SearchResults to the view
            return PartialView("AddCategory", model);
        }

    }
}