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Creating an interface for a specialised form

Hello

I am trying to create an interface for a specialised form, ie I want
to make sure that the implementations of this interface are a form
(System.Windows.Forms.Form), but also contain a specialised public
property (CurrentUsername).

I was going to create an interface which specifies the requirement for
a property called CurrentUsername, but don't know how to ensure that
objects passed to the function that consumes objects that implement
this interface are in fact always forms and not another object with a
CurrentUsername property...

Does anyone know how I can specify in an interface or within the
parameter list of a method that the parameter should implement a
particular interface (ie should contain a CurrentUsername property),
but should also be a System.Windows.Forms.Form object or a
specialisation of said object?

Thanks

PDarroch

p.s. sorry for my technical ineptness in o-o matters
Nov 22 '05 #1
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