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    Namespace System.IO

    Classes

    Directory

    Class for managing directories

    File

    Class for creating FileStream objects, and some basic file management routines such as Delete, etc.

    FileStream

    Provides a Stream for a file, supporting both synchronous and asynchronous read and write operations.

    IOException

    The exception that is thrown when an I/O error occurs.

    MemoryStream

    Creates a stream whose backing store is memory.

    Path

    Performs operations on String instances that contain file or directory path information.

    Stream

    Provides a generic view of a sequence of bytes. This is an abstract class.

    StreamReader

    Implements a TextReader that reads characters from a byte stream in a particular encoding.

    StreamWriter

    Implements a TextWriter for writing characters to a stream in a particular encoding.

    TextReader

    Represents a reader that can read a sequential series of characters.

    TextWriter

    Represents a writer that can write a sequential series of characters. This class is abstract.

    Enums

    FileAccess

    Contains constants for specifying the access you want for a file. You can have Read, Write or ReadWrite access.

    FileAttributes

    Provides attributes for files and directories.

    FileMode

    Contains constants for specifying how the OS should open a file. These will control whether you overwrite a file, open an existing file, or some combination thereof.

    To append to a file, use Append (which maps to OpenOrCreate then we seek to the end of the file). To truncate a file or create it if it doesn't exist, use Create.

    FileShare

    Contains constants for controlling file sharing options while opening files. You can specify what access other processes trying to open the same file concurrently can have.

    IOException.IOExceptionErrorCode

    Provides values for error codes.

    SeekOrigin

    Specifies the position in a stream to use for seeking.

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