What is the difference between the non-generic IEnumerable and the generic IEnumerable?

Question

Sorry for such a vague question, but I have been searching around for the best part of a day, I have read article after article (and many questions here) but just cannot fin

Answer 1

The word you're looking for is "generics", and the example you give is IEnumerable being used as a generic for items of type int. What that means is that the IEnumerable collection you are using is strongly-typed to only hold int objects as opposed to any other type.

Google "C# generics IEnumerable" and you will find all of the information you want on this.