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In VB.Net you can do something like the following without any issues... just ignore the fact that this is a pretty useless class :-) Imports System Public Class Class1 Public Shared Function ArrayToList(ByVal _array() As String) As Collections.Generic.List(Of String) Return New Collections.Generic.List(Of String)(_array) End Function End Class However if you do the same thing in C#... using System; public class Class1 { public static Collections.Generic.List ArrayToList(string[] _array) { return new Collections.Generic.List(_array); } } You will get an error on the line with the return on "Collections.Generic.List" saying "The type or namespace name 'Collections' could not be found (are you missing a using directive or an assembly reference?)" I know that you have to actually have a using directive to System.Collections.Generic to use List but I don't know why . I also don't understand why I don't get the same error in the function declaration, but only in the return statement. I was hoping someone can explain this or even refer me to a technet page that explains it. I have searched around, but can't find anything that explains this concept. Edit: Just to note, the question is really about the referencing of a sub-namespace such as in the example being able to reference Collections within System.

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