Enum FileMode Path C++ Link System.IO.FileMode, mscorlib underlying int32 mscorlib.dll Values 6 NameValueHex CreateNew10x01Create20x02Open30x03OpenOrCreate40x04Truncate50x05Append60x06 Used by 7types with a member, parameter or interface of this type FileFileStreamFileSystemFileWebStreamKernel32LocalFileMonoIO // System.IO.FileMode, mscorlib enum class FileMode : int32 { CreateNew = 1, Create = 2, Open = 3, OpenOrCreate = 4, Truncate = 5, Append = 6, };