Forcing the setting of a required elements attribute

[jwwishart]

Hi,

Does anyone know if there is an Attribute (like:
DefaultValueAttribute) etc that will create a warning etc that says

"You have to specify a value for this attribute"

ie. The following should cause an error or warning at least!

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public class MyUserControl
inherits UserControl

public property YouMustManuallySetMe as boolean
' content here.
end property
end class

<uc1:MyUserControl id="bla" runat="server" />