Linear Search with c#

 class Program
    {

        static void Main(string[] args)
        {
            linearIndex(0);
            Console.ReadLine();
        }

        public static int linearIndex(int searchNumber)
        {

            int index = 0;
            int[] intArray = { 
        47,56,38,5,40,17,26,58,56,25,10,14,38,10,36,15,36,53,55,33,10,48,6,45,

       38,10,49,47,53,10,52,45,32,46,55,19,55,53,11,39,36,25,26,41,15,1,43,
       40,13,53,39,11,53,33,5,21,36,53,15,36};

         l1:   if (searchNumber == intArray[index])
            {
                Console.WriteLine("found at! : {0}", index);
                return index;
            }

            index ++;
            if (index < intArray.Length)
            {
                goto l1;
            }
            else
            {
                Console.WriteLine("Not found at any Index");
            }

            return 0;
        }

    }