.Net 4.0 has come up with Lazy initialization class, meaning initialize when needed. So when object is declared, memory for object is not allocated until it is actually needed. This class can be used for any custom type as you can see the in title Lazy(Of T)
Lets see this, suppose we have following class.

Public Class person
    'Remember Property can be defined in one line now
    Public Property Age As Integer

    Public Sub New(ByVal _Age As Integer)
        Age = _Age
    End Sub
    'To work with Lazy class, we need New without constructor, oh...
    Public Sub New()
        Age = 45
    End Sub
End Class

Now, A test with Lazy Class
        Dim person1 As New System.Lazy(Of person)
        'Check whether its created
        Debug.WriteLine("Value created before Use?: {0}", person1.IsValueCreated)

        Debug.WriteLine("Person's Age: {0}", person1.Value.Age)
        'Lets Check Again, it must be created since value was needed in above line
        Debug.WriteLine("Value created after Use?: {0}", person1.IsValueCreated)
        'To assign the age
        person1.Value.Age = 56
        Debug.WriteLine("New age {0}", person1.Value.Age)