In C#, the foreach loop iterates collection types such as Array, ArrayList, List, Hashtable, Dictionary, etc. It can be used with any type that implements the IEnumerable interface.
The following examples demonstrates iteration of an array and a list collection using a foreach loop.
The
System.Collections.Generic namespace contains the ForEach() extension method that can be used with any built-in collection classes such as List, Dictionary, SortedList, etc.