Snippets for 2010 blog post "An MVC Gotcha and the PRG Pattern"

MVCG1.cs

using System;

namespace MvcGotcha1.Models  
{
    public class FooModel
    {
        public int FooCounter { get; set; }
    }
}

MVCG2.cshtml

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MvcGotcha1.Models.FooModel>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    Foo
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <h2>Foo</h2>
    <% using (Html.BeginForm())
        { %>
        <%=Html.TextBoxFor(m=>m.FooCounter) %><br />
        <%=Html.DisplayFor(m=>m.FooCounter) %><br />
        <input type="submit" value="Increment!" />
    <% } %>
</asp:Content>

MVCG3.cs

using System;  
using System.Web.Mvc;  
using MvcGotcha1.Models;

namespace MvcGotcha1.Controllers  
{
    public class FooController : Controller
    {
        public ActionResult Index()
        {
            var model = new FooModel() { FooCounter = 1 };
            return View(model);
        }

        [HttpPost]
        public ActionResult Index(FooModel model)
        {
            model.FooCounter++;
            return View(model);
        }
    }
}

MVCG4.cs

using System;  
using System.Web.Mvc;  
using MvcGotcha1.Models;

namespace MvcGotcha1.Controllers  
{
    public class FooController : Controller
    {
        public ActionResult New()
        {
            var model = new FooModel() { FooCounter = 1 };
            Session["model"] = model;
            return RedirectToAction("Index");
        }

        public ActionResult Index()
        {
            var model = Session["model"];
            return View(model);
        }

        [HttpPost]
        public ActionResult Index(FooModel model)
        {
            model.FooCounter++;
            Session["model"] = model;
            return RedirectToAction("Index");
        }
    }
}