How to equal sub class from base class

[Steven.Xu]

I have an instance B of class C1. How can i let variable
BB which class inherits from C1 equal from B in VB.NET?

For example:

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as new C1;
Dim BB as CC1;

' How to realize BB = B?

End Sub

My mail address is: xu********@hotm ail.com

[One Handed Man [ OHM# ]]

If TypeOf CC Is BB

Regards - OHM

Steven.Xu wrote:

I have an instance B of class C1. How can i let variable
BB which class inherits from C1 equal from B in VB.NET?

For example:

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as new C1;
Dim BB as CC1;

' How to realize BB = B?

End Sub

My mail address is: xu********@hotm ail.com

--
Best Regards - OHM

O_H_M{at}BTInte rnet{dot}com

[Codemonkey]

You can't assign a base class instance to a derived class instance because
the derived class hasn't been created, but you can do the opposite:

e.g.

------------------

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as C1
Dim BB as New CC1

B = BB

End Sub

-----------------

See http://tinyurl.com/39jju or

http://groups.google.com/groups?hl=e...erived%2Bclass
for a longer explanation
"Steven.Xu" <xu********@hot mail.com> wrote in message
news:04******** *************** *****@phx.gbl.. .

I have an instance B of class C1. How can i let variable
BB which class inherits from C1 equal from B in VB.NET?

For example:

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as new C1;
Dim BB as CC1;

' How to realize BB = B?

End Sub

My mail address is: xu********@hotm ail.com

[One Handed Man [ OHM# ]]

Damn, I missed the absence of the 'New' keyword. Well spotted CM.

Regards - OHM

Codemonkey wrote:

You can't assign a base class instance to a derived class instance
because the derived class hasn't been created, but you can do the
opposite:

e.g.

------------------

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as C1
Dim BB as New CC1

B = BB

End Sub

-----------------

See http://tinyurl.com/39jju or

http://groups.google.com/groups?hl=e...erived%2Bclass

for a longer explanation
"Steven.Xu" <xu********@hot mail.com> wrote in message
news:04******** *************** *****@phx.gbl.. .

I have an instance B of class C1. How can i let variable
BB which class inherits from C1 equal from B in VB.NET?

For example:

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as new C1;
Dim BB as CC1;

' How to realize BB = B?

End Sub

My mail address is: xu********@hotm ail.com

--
Best Regards - OHM

O_H_M{at}BTInte rnet{dot}com