public static Task<IEnumerable<NbUser>> QueryUserAsync(
	string username = null,
	string email = null,
	NbService service = null
)

Public Shared Function QueryUserAsync ( 
	Optional username As String = Nothing,
	Optional email As String = Nothing,
	Optional service As NbService = Nothing
) As Task(Of IEnumerable(Of NbUser))

public:
static Task<IEnumerable<NbUser^>^>^ QueryUserAsync(
	String^ username = nullptr, 
	String^ email = nullptr, 
	NbService^ service = nullptr
)

static member QueryUserAsync : 
        ?username : string * 
        ?email : string * 
        ?service : NbService 
(* Defaults:
        let _username = defaultArg username null
        let _email = defaultArg email null
        let _service = defaultArg service null
*)
-> Task<IEnumerable<NbUser>>