public void AddFlowerToFlowerCollection(string className, int count, string flowername)
        {
            Flower fl;

            for (int i = 0; i < count; i++)
            {
                switch (className)
                {
                case "Astra":
                    fl = new Astra(flowername);
                    break;

                case "Tulip":
                    fl = new Tulip(flowername);
                    break;

                case "Violet":
                    fl = new Violet(flowername);
                    break;

                default:
                    throw new Exception("Flower type not found.");
                }

                this.FlowerCollection.Add(fl);
            }
        }
        static void Main(string[] args)
        {
            var Bobby = new Rose();
            var Dandy = new Dandelion();
            var Sunny = new Sunflower();
            var Vi    = new Violet();

            FlowerShop       MacsFlowerShop = new FlowerShop();
            List <IBirthDay> Arrangement    = MacsFlowerShop.MakeBirthDayArrangement();
        }