别错过！c#枚举引用该怎么办

class Program
    {
        public enum week { Monday=1,Tuesday=2,Wednesday=3,Thursday=4,Friday=5,Saturday=6,Sunday=7 };
        static void Main(string[] args)
        {
            int wk;string x;
            Console.WriteLine("please input the date");
            x=(string)( Console.ReadLine());
            Console.WriteLine("{0}", x);
            wk=(int)week.x
            switch(wk)
            {
                case 1:Console.WriteLine("dumpling,$5");break;
                case 2: Console.WriteLine("noodle,$3"); break;
                case 3: Console.WriteLine("meat,$7"); break;
                case 4: Console.WriteLine("beef,$20"); break;
                case 5: Console.WriteLine("steak,$15"); break;
                case 6: Console.WriteLine("fruit sala,$6"); break;
                case 7: Console.WriteLine("roast potato,$5"); break;
                default:Console.WriteLine("input the wrong number"); break;
            }
求助，我该怎么引用我定义的枚举类型呢

wk = Enum.Parse(typeof(week)，x);