こういうのはいいのかどうか

ASP.NET MVC Transaction Attribute (using NHibernate) - Scott's Blog

NHibernateじゃなくても、以下のようなTransactionAttributeで。

using System;
using System.Transactions;
using System.Web.Mvc;

namespace MainSite.Controllers
{
  [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false)]
  public class TransactionAttribute : ActionFilterAttribute
  {
    private TransactionScope _transactionScope;

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
      _transactionScope = new TransactionScope();

      base.OnActionExecuting(filterContext);
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
      base.OnActionExecuted(filterContext);

      if (filterContext.Exception == null)
        _transactionScope.Complete();

      _transactionScope.Dispose();
    }
  }
}

適当なDataContextを用意してこれまた適当なAction(適当すぎてすいません)で。

    public ActionResult Index()
    {
      ViewData["Message"] = "Welcome to ASP.NET MVC!";

      return View();
    }

    [HttpPost,ActionName("Index")]
    [Transaction]
    public ActionResult IndexPost(string name)
    {
      var db = new DataClasses1DataContext();
      db.Table1s.InsertOnSubmit(new Table1 {name = name});
      db.SubmitChanges();

      //throw new HttpException(500,"Error!");
      return RedirectToAction("Index");
    }

Unit of Workって言うんですかね～。Exception起こせばロールバックするんだけど．．．。トランザクションってこのレイヤで意識するものなのかな～。う～ん。好みや規模に合わせて好きなやり方でどうぞ、ってことで。