public static string Sub(
	string input,
	int len,
	string append = null
)

Public Shared Function Sub ( 
	input As String,
	len As Integer,
	Optional append As String = Nothing
) As String

public:
static String^ Sub(
	String^ input, 
	int len, 
	String^ append = nullptr
)

static member Sub : 
        input : string * 
        len : int * 
        ?append : string 
(* Defaults:
        let _append = defaultArg append null
*)
-> string