what is Ienumerator with example?

IEnumerator is an interface, which when implemented allows you to iterate through the list of controls. To implement it requires that you provide two methods - Reset to go back to the beginning of the list, and MoveNext to move forward, and Current to get the current item. MSDN provides an example here: http://msdn.microsoft.com/en-us/library/system.collections.ienumerator.aspx[^]
Once you have implemented IEnumerable for your class, it can become the target of a foreach loop, among other things.

In simple words Ienumerator is an iteration over a collection (non-generic). It is the base interface for enumerators. However, enumerators can be used to read data in a collection, and it cannot be used to modify the data in the collection. So you can think and example yourself to meet the above basic conditions. Give a try, and let us know if you are stuck.

Refer this
Using IEnumerator and IEnumerable in the .NET Framework[^]

http://code.hammerpig.com/example-of-implementing-ienumerable-and-ienumerator-in-c.html[^]