TPortable ReadPortable<TPortable>(
	string fieldName
)
where TPortable : IPortable

Function ReadPortable(Of TPortable As IPortable) ( 
	fieldName As String
) As TPortable

generic<typename TPortable>
where TPortable : IPortable
TPortable ReadPortable(
	String^ fieldName
)

abstract ReadPortable : 
        fieldName : string -> 'TPortable  when 'TPortable : IPortable