Shopping Cart and Checkout Asp.net MVC

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C#

ASP.NET

MVC

EF6.0

Hi. I'm trying to create a simple ecommerce, but i'm in trouble. Here's my code until now.




Classes:

public class Design
{
    [Key]
    public int DesignId { get; set; }
    public String name{ get; set; }
    public Decimal price{ get; set; }

    public virtual ICollection<ItemDesign> ItemDesign { get; set; }
}

public class ItemDesign
{
    [Key]
    public int ItemDesignId { get; set; }
    public int DesignId { get; set; }
    public int OrderId{ get; set; }

    public virtual Design Design { get; set; }
    public virtual Order Order { get; set; }
}

public class Pedido
{
    [Key]
    public int OrderId { get; set; }
    public int UserId { get; set; }
    public DateTime DtOrder { get; set; }
    public StatusOrder StatusOrder { get; set; }
    public string Username {get; set;}
    public string TypePayment {get; set;}
    public DateTime DtPayment { get; set; }
    public Decimal TotalPrice { get; set; }

    public virtual User User { get; set; }
    public virtual ICollection<ItemDesign> ItemDesign { get; set; }
}

Actions:

public ActionResult AddCart(int id)
  {

      Order cart = Session["Cart"] != null ? (Order)Session["Cart"] : new Order();

      var design = db.Design.Find(id);

      if (design != null)
      {
          var itemDesign = new ItemDesign();
          itemDesign.Design = design;
          itemDesign.Qtd = 1;

          if (cart.ItemDesign.FirstOrDefault(x => x.IdDesign == design.IdDesign) != null)
          {
              cart.ItemDesign.FirstOrDefault(x => x.IdDesign == design.IdDesign).Qtd += 1;
          }

          else
          {
              cart.ItemDesign.Add(itemDesign);
          }


          cart.ValorTotal = cart.ItemDesign.Select(i => i.Design).Sum(d => d.price);

          Session["cart"] = cart;
      }

      return RedirectToAction("cart");
  }

  public ActionResult Cart()
  {
      Order cart = Session["cart"] != null ? (Order)Session["cart"] : new Order();

      return View(cart);
  }

My trouble is, I'm lost after the creation of the cart. How can I'm going to save the cart in the database? And, how can I make a checkout? I want the user insert his name and the way of payment. Them, I want to save the order, and the cart in the database. Anyone can help?