Second Highest Number

static void Main(string[] args)
        {
            Console.WriteLine("Insert 10 numbers");
            Console.WriteLine("=====================");
            string x = Console.ReadLine();
            string[] split = x.Split(new char[] { ' ' });
            if (split.Length < 9)
            {
            Console.WriteLine("Please insert 10 numbers");
            Console.WriteLine("=====================");
            x = Console.ReadLine();
            split = x.Split(new char[] { ' ' });
            }

            Console.WriteLine("Second highest number: ");
            Console.WriteLine("=====================");
            Array.Sort(split);
            Console.WriteLine(split[split.Length - 1]);
        }