public void PopulateTables()
        {            
            using (TechShopEntities context = new TechShopEntities())
            {                
                try
                {
                    
                    context.mobile_phones.AddObject(
                        new mobile_phones() {
                            amount=1, 
                            available_in_stock=true, 
                            color="blue", 
                            id=100, 
                            manufacturer = "nokia", 
                            model = "x1-01", 
                            price=200.00 });
                    context.SaveChanges();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.InnerException.Message);                        
                }                                                  
            }
        }