YieldKeyWordDemo.cs

class Program
    {
        static void Main(string[] args)
        {
            IEnumerable<int> result = PowerMe(2, 3);
            foreach (var item in result)
            {
                Console.WriteLine(item);
            }
            
            Console.ReadKey();
        }

        // Returns IEnumerable
        // Like streaming video
        // When an item is created in IEnumerable, it returns the single item and comes back
        // Yield keyword remembers where it has to start for the next iteration
        static IEnumerable<int> PowerMe(int number, int exponent)
        {
            int result = 1;
            for (int i = 0; i < exponent; i++)
            {
                result = result * number;
                yield return result;
            }            
        }
    }