method override in controller class

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MVC3

hiiiiiiiiiiii frnd....


i want to override method in controler class .....

public ViewResult Details(int id,int catid)
        {
            Product product = db.Products.Single(p => p.ProductID == id && p.CategoryID== catid);
            return View();
        }
        // GET: /Product/Details/5
       
      
        public ViewResult Details(int id)
        {
            Product product = db.Products.Single(p => p.ProductID == id);
            return View(product);
        }


        public ViewResult Details(int id,string Productname)
        {
            Product product = db.Products.Single(p => p.ProductID == id && p.ProductName == Productname);
            return View(product);
        }

how to achieve this.....
pls help me.............