public ActionResult Create(Memo memo)
		{
			if (ModelState.IsValid)
			{
				string id = (string)Session["id"];
				string password = (string)Session["password"];
				User user = (from p in context.Users
							 where (p.LoginId == id && p.LoginPassword == password)
							 select p).Single();

				memo.User = user;
				memo.UserId = user.UserId;
				memo.CreatedAt = DateTime.Now;
				memo.UpdateAt = DateTime.Now;
				context.Memos.Add(memo);
				context.SaveChanges();
				context.Entry(memo).State = EntityState.Unchanged;

				return RedirectToAction("Index");
			}
			return View(memo);
		}
		public ActionResult Edit( Memo memo)
		{
			User user = (from p in context.Users
						 where (p.UserId == memo.UserId)
						 select p).SingleOrDefault();

			memo.User = user;
			memo.UpdateAt = DateTime.Now;
			context.Entry(memo).State = EntityState.Modified;
            context.SaveChanges();
			return RedirectToAction("Details", new { id = memo.MemoId});
		}