In many projects I work on, whenever I have to return a read only collection, I use the IEnumerable<T> interface and make it type specific like so:

Public ReadOnly Property GetValues() As IEnumerable(Of Integer)
    Get
        'code to return the values'
    End Get
End Property

Most of the time, I return a List but in some functions and read only properties I return an array which also serves the purpose alright by kind courtesy of Extension Methods.

My question is am I violating any design principles by returning IEnumerable<T>s instead of specific types (e.g.: List<T>, HashSet<T>, Stack<T> or Arrays)?

c# .net vb.net design-principles
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