using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Collections;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            CountingEnumerable counter = new CountingEnumerable();            foreach (int x in counter)            {                Console.WriteLine(x);            }            Console.ReadKey();        }    }    class CountingEnumerable : IEnumerable
     
          {        public IEnumerator
      
        GetEnumerator()        {            return new CountingEnumerator();        }        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()        {            return GetEnumerator();        }    }    class CountingEnumerator : IEnumerator
       
            {        int current = -1;        public int Current        {            get { return current; }        }                object System.Collections.IEnumerator.Current        {            get { return Current; }        }        public bool MoveNext()        {            current++;            return current < 10;        }        public void Reset()        {            current = -1;        }        public void Dispose()        {        }    }}