public static int? TrayParse(string text) {             int ret;             if (int.TryParse(text,out ret)) {                 return ret;             }             else {                 return null;             }         }static void Main(string []argd){ int? parsed = TrayParse("Not Valid");            if (parsed.HasValue) {                Console.WriteLine("Parsed to {0}",parsed.Value);            }            else {                Console.WriteLine("Couldn‘t parse");            }}