<PackageReference Include="NETStandard.Library" Version="2.0.1" />

System.Net.FtpStatusCode

public enum FtpStatusCode
namespace System.Net { public enum FtpStatusCode { AccountNeeded = 532, ActionAbortedLocalProcessingError = 451, ActionAbortedUnknownPageType = 551, ActionNotTakenFilenameNotAllowed = 553, ActionNotTakenFileUnavailable = 550, ActionNotTakenFileUnavailableOrBusy = 450, ActionNotTakenInsufficientSpace = 452, ArgumentSyntaxError = 501, BadCommandSequence = 503, CantOpenData = 425, ClosingControl = 221, ClosingData = 226, CommandExtraneous = 202, CommandNotImplemented = 502, CommandOK = 200, CommandSyntaxError = 500, ConnectionClosed = 426, DataAlreadyOpen = 125, DirectoryStatus = 212, EnteringPassive = 227, FileActionAborted = 552, FileActionOK = 250, FileCommandPending = 350, FileStatus = 213, LoggedInProceed = 230, NeedLoginAccount = 332, NotLoggedIn = 530, OpeningData = 150, PathnameCreated = 257, RestartMarker = 110, SendPasswordCommand = 331, SendUserCommand = 220, ServerWantsSecureSession = 234, ServiceNotAvailable = 421, ServiceTemporarilyNotAvailable = 120, SystemType = 215, Undefined = 0 } }