How do I Aggregate multiple IEnumerables of T

Question

Given....

Public MasterList as IEnumerable(Of MasterItem)
Public Class MasterItem(Of T) 
    Public SubItems as IEnumerable(Of T)
End Class 

I

Answer 1

You can achieve this by Linq with SelectMany

C# Code

masterLists.SelectMany(l => l.SubItems);

Best Regards