Color is a Structure, hence a ValueType whereas Pen is a Reference type.
Everythign in .NET is an 'object' btw. That's why even though integer is an
object , Dim i as Integer is ok. This may help a little if you aren't
familiar with the distinction
http://www.knowdotnet.com/articles/referencetypes2.html
The difference in behavior between valuetypes and referencetypes is NOT
trivial by any means, but understanding the differences is pretty
straightforward. For instance, pass in a Value Type by value to function
and modify it, the original is still in tact. Pass in a Reference Type
ByVal to a method and any changes made to it are made to the object you
passed in.
I'm not sure I totally understand your second question but I'll take a
guess. Those properties are instance properties, meaning they belong to the
instance. Other properties are static (shared in VB) which means they
belong to the class and not a specific instance.
HTh,
Bill
--
W.G. Ryan MVP Windows - Embedded
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"Sam" <qdo@datawave.ca> wrote in message
news:Oztn9IndEHA.2812@tk2msftngp13.phx.gbl...[color=blue]
> Hi everyone
>
> Could anyone help me understand the usage of the "New" keyword I'm new[/color]
to[color=blue]
> VB.Net.
>
> 1. Why do we use the "New" keyword on some object type variables such as[/color]
the[color=blue]
> myPen of the example below and not with the bgColor. Both the Pen and[/color]
Color[color=blue]
> are objects
>
> Dim myPen As Pen = New Pen(Color.AquaMarine)
> Dim bgColor As Color = Color.LightYellow
>
> 2. Why do properties such as Size, Location, Font... of controls require a
> new instance of their classes when we want to change their properites at[/color]
run[color=blue]
> time
>
>
> Thanks
>
> Sam
>
>[/color]
