I/O in C#

Object

       |

        \----BinaryReader------\

        |                        |-->Binary IO used to read primitive data types(int,char..)    

        |----BinaryWriter------/

        |

        |

        |----Stream(Abstract)       ---> Byte Oriented IO   

        |       |

        |         \

        |         |-----FileStream

        |         |-----BufferedStream

        |         `-----MemoryStream

        |

        |

        |----TextReader(Abstract) ---> Character Based IO (For Reading....)

        |        |

        |         \

        |         |-----StreamReader

        |         `-----StringReader    

        |

        `----TextWriter(Abstract) ---> Character Based IO (For Writing....)

                |

                 \

                 |-----StreamWriter

                 `-----StringWriter     

Reference: http://www.csharphelp.com/archives4/archive673.html