The way compiler works with Enumerator

The interface IEnumerable contains ONLY method GetEnumerator() which will return IEnumerator of that collection type. IEnumerator interface contains two methods and one property

1. object Current bool
2.  MoveNext() 
3. void Reset() 

Example:

List<string> name = new List<string>();
name.Add("Harvey");
name.Add("Dent");
name.Add("Clerik");

       foreach (var s in name)
            {

              Console.WriteLine ("Name: {0}", s);
         }

Now the above code will be manipulated by compiler as shown below:

IEnumerator<string> enumerator = name.GetEnumerator ();
while (enumerator.MoveNext())
{
string s = (string)enumerator.Current;
Console.WriteLine ("Name Compiler's Way: {0}", s);
}

source: Dhananjay Kumar

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