I have a Dictionary with key of type UInteger and the value is List(Of Session) where the (Public) class Session contains a couple of variables and a constructor (Public Sub New(...)).

Some of the variables in my Session class is:

Private count As Integer
Private StartDate As Date
Private Values As List(Of Integer)

and a couple of methods like:

Friend Sub Counter(ByVal c as Integer)
    count += c
End Sub

There is no problem to add values to the Dictionary:

Dim Sessions As New List(Of Session)
Dim dict As New Dictionary(Of Integer, Sessions)

then some code to fill up a couple of Session objects in Sessions (not shown here) and then:

dict.Add(17, Sessions) 'No problem
Sessions.Clear()
Sessions = dict(17) 'This doesn't return anything!

The Sessions object is empty even if the code doesn't returned any error. Is my class Session to compex to be stored in a Dictionary?