System.Collections.Generic.IEnumerable<T>

Added in .NET 2.0
Arrays automatically implement IEnumerable<T> where T is the member type of the array.

public interface IEnumerable<T> : IEnumerable 
{ 
   IEnumerator<T> GetEnumerator(); 
} 

class MyList2<T> : IEnumerable<T> 
{ 
} 

MyList2<string> mylist; 

mylist = new MyList2<string>(); 
mylist.Add("Monday"); 
mylist.Add("Tuesday"); 

foreach (string s in mylist) 
{ 
   System.ConsoleWriteLine(s); 
} 

Generic Collection - IEnumerable<T>
Enumerating a generic collection class

System.Collections.Generic.List<string> mylist; 

mylist = new System.Collections.Generic.List<string>(); 
mylist.Add("Monday"); 
mylist.Add("Tuesday"); 

foreach (string s in mylist) 
{ 
   System.ConsoleWriteLine(s); 
}