webshop visual studios 2010

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using GarageDBModel;

/// <summary>
/// Summary description for ProductModel
/// </summary>
public class ProductModel
{
    public string InsertProduct(Product product)
    {
        try
        {
            GarageDBEntities db = new GarageDBEntities();
            db.Products.Add(product);
            db.SaveChanges();

            return product.Name + "was succesfuly Inserted";
        }
        catch (Exception e)
        {
            return "Error:" + e;
        }
    }

    public string UpdateProduct(int id, Product product)
    {
        try
        {
            GarageDBEntities db = new GarageDBEntities();
            Product p = db.Products.Find(id);
        }
        catch(Exception e)
        {
            return "Error:" + e;
        }
    }

Error   4   'System.Data.Objects.ObjectSet<GarageDBModel.Product>' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'System.Data.Objects.ObjectSet<GarageDBModel.Product>' could be found (are you missing a using directive or an assembly reference?) C:\Users\Zaid\Documents\Visual Studio 2010\WebSites\Garagemanager\App_Code\Models\ProductModel.cs   18  25  C:\...\Garagemanager\

Error   5   'System.Data.Objects.ObjectSet<GarageDBModel.Product>' does not contain a definition for 'Find' and no extension method 'Find' accepting a first argument of type 'System.Data.Objects.ObjectSet<GarageDBModel.Product>' could be found (are you missing a using directive or an assembly reference?)   C:\Users\Zaid\Documents\Visual Studio 2010\WebSites\Garagemanager\App_Code\Models\ProductModel.cs   34  37  C:\...\Garagemanager\