ArrayList inside Structure/Class

Is it not possible to use an ArrayList inside of a Structure or a Class?

I keep getting 'Object reference not set to instance of an object'

I am using New.

i.e.

Stucture ABC
Dim al as ArrayList
End Structure


Private Sub X()

Dim Struct1 as New ABC

Struct1.al.Add("anything")

End Sub

It's because the arraylist hasn't been instanciated yet.

I'm not a 100% sure if you can do this inside a Structure, if not then use a Class instead.

VB Code:

Structure ABC
    Public al as ArrayList = New ArrayList
End Structure

or

VB Code:

Structure ABC
    Public al as ArrayList
 
    Public Sub New()
        al = New ArrayList
    End Sub
End Structure

Your first solution works for a class. Thanks grillkip.