cannot convert from 'P.CoffeeShopDBEntities' to '

我试图在Visual Studio 2013 (c#)中重新创建代码(我在视频中看到过)，这是用VS2008 (c#)编写的:我已经尝试了EF 6和EF 5版本选项相同的结果…搜索网页和MSDN没有运气。

下面是我的代码和注释，显示了我得到的错误:

 private CoffeeShopDBEntities cse = new CoffeeShopDBEntities();
        private void AddProductsToTabbedPanel()
        {
           // using (CoffeeShopDBEntities context = new CoffeeShopDBEntities()) 
     //--found this on msdn..got rid of old but end up w/2 new errors see below
      {
   //the foreach code below goes here
    }

            foreach(TabPage tp in tabControl1.TabPages)
            {
                ObjectQuery<tblProduct> filteredProduct = new ObjectQuery<tblProduct>
                    ("SELECT VALUE P FROM tblProducts AS P", cse);
                //when 'context' used 1)possible mistaken empty statment 
                //2)the name 'context' doesnt exist in the current context
                //when 'cse'used :
                //Error 1 The best overloaded method match for 'System.Data.Objects.ObjectQuery<P.tblProduct>.ObjectQuery(string, System.Data.Objects.ObjectContext)' has some invalid arguments    
                //Error 2 Argument 2: cannot convert from 'P.CoffeeShopDBEntities' to 'System.Data.Objects.ObjectContext'
           foreach (tblProduct tprod in filteredProduct)
                 {
                    Button b = new Button();
                    b.Text = tprod.Description;
                    tp.Controls.Add(b);
                 }
            }
        }

我在Stack Overflow上发现了一个类似的问题，回复说这是一个语法错误，但没有指出在哪里。