> I have two classes, class1 and class2.
> class2 inherits from class1. I'm wondered that what's the difference
> between:
> Dim myObj as Class1 = New Class2
> and
> Dim myObj as Class2 = New Class2
> In both cases MsgBox(TypeOf myObj Is Class1) returns true.

> But if I need access to Class1 members, I can write:
> Dim MyObj as Class1 = New Class1
> What's the usage for being able to write:
> Dim MyObj as Class1 = New Class2

"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> wrote in message
news:#xejWwzkEHA.3756@TK2MSFTNGP11.phx.gbl...
> * "Amin Sobati" <amins@morva.net> scripsit:
> > I have two classes, class1 and class2.
> > class2 inherits from class1. I'm wondered that what's the difference
> > between:
> > Dim myObj as Class1 = New Class2
> > and
> > Dim myObj as Class2 = New Class2
> > In both cases MsgBox(TypeOf myObj Is Class1) returns true.
>
> Both objects will be objects of type 'Class2', but 'Class1' is a
> supertype of 'Class2', so assigning an instance to a variable of type
> 'Class1' will only allow you to see/access members defined in 'Class1',
> even if you are dealing with an object of type 'Class2'.
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://dotnet.mvps.org/dotnet/faqs/>