public Address(
	string protocol,
	string system,
	string host = null,
	Nullable<int> port = null
)

Public Sub New ( 
	protocol As String,
	system As String,
	Optional host As String = Nothing,
	Optional port As Nullable(Of Integer) = Nothing
)

public:
Address(
	String^ protocol, 
	String^ system, 
	String^ host = nullptr, 
	Nullable<int> port = nullptr
)

new : 
        protocol : string * 
        system : string * 
        ?host : string * 
        ?port : Nullable<int> 
(* Defaults:
        let _host = defaultArg host null
        let _port = defaultArg port null
*)
-> Address