Code for adding to IEnumerable

Question

I have an enumerator like this

IEnumerable page;

How can I add a page (eg: D:\\newfile.txt) to it

Answer 1

IEnumerable is immutable. You can't add items, you can't delete items.
The classes from System.Collections.Generic return this interface so you can iterate over the items contained in the collection.

From MSDN

Exposes the enumerator, which supports a simple iteration over a collection of a specified type.

See here for MSDN reference.