Skip the foreach and manually use the enumerable and enumerator for a 'yield' IEnumerable : Yield : Data Structure C# Examples

    
using  System;
using  System.Collections.Generic;  

class  LetterCollection
{
      string[]  letters  ={  "A",  "B",  "C"};
      
      public  IEnumerable<string>  Forward()                                              
      {
            for  (int  i  =  0;  i  <  letters.Length;  i++)
                  yield  return  letters[i];
      }
}

class  MainClass
{
      static  void  Main()
      {
            LetterCollection  cc  =  new  LetterCollection();

            
            IEnumerable<string>  ieable  =  cc.Forward();
            IEnumerator<string>  ieator  =  ieable.GetEnumerator();

            while  (ieator.MoveNext())
                  Console.Write("{0}  ",  ieator.Current);
      }
}