public RallyRestApiAuthenticationResult AuthenticateWithZSessionID(
	string userName,
	string zSessionID,
	string rallyServer = "https://rally1.rallydev.com",
	WebProxy proxy = null,
	bool allowSSO = true
)

Public Function AuthenticateWithZSessionID ( 
	userName As String,
	zSessionID As String,
	Optional rallyServer As String = "https://rally1.rallydev.com",
	Optional proxy As WebProxy = Nothing,
	Optional allowSSO As Boolean = true
) As RallyRestApiAuthenticationResult

public:
RallyRestApiAuthenticationResult AuthenticateWithZSessionID(
	String^ userName, 
	String^ zSessionID, 
	String^ rallyServer = L"https://rally1.rallydev.com", 
	WebProxy^ proxy = nullptr, 
	bool allowSSO = true
)

member AuthenticateWithZSessionID : 
        userName : string * 
        zSessionID : string * 
        ?rallyServer : string * 
        ?proxy : WebProxy * 
        ?allowSSO : bool 
(* Defaults:
        let _rallyServer = defaultArg rallyServer "https://rally1.rallydev.com"
        let _proxy = defaultArg proxy null
        let _allowSSO = defaultArg allowSSO true
*)
-> RallyRestApiAuthenticationResult 

RallyRestApi restApi = new RallyRestApi();
WebProxy myProxy = new WebProxy();
restApi.AuthenticateWithZSessionID("myuser@company.com", "zSessionID", proxy: myProxy);