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.NET Framework  Namespace References  System  System.Collections  System.Globalization  System.IO     BinaryReader   Class    BinaryWriter   Class    BufferedStream   Class    Directory   Class    DirectoryInfo   Class    File   Class    FileAccess   Enumeration    FileAttributes   Enumeration    FileInfo   Class    FileMode   Enumeration    FileShare   Enumeration    FileStream   Class    FileSystemWatcher   Class    MemoryStream   Class    Path   Class    SeekOrigin   Enumeration    StreamReader   Class    StreamWriter   Class    StringReader   Class    StringWriter   Class   Articles and Tutorials  Overview of .NET  Delphi and .NET  Winform Applications  ASP .Net Applications  php Web Services  Framework Collections  Framework String Handling  Framework Files and Folders       System.IO.FileMode Enumeration    Description The FileMode enumeration is used by various File handling classes (see the links below) to define one of a set of mutually exclusive ways in which a file can be opened.  Values Append       Opens the file if it exists and seeks to the end of the file, or creates a new file. FileMode.Append can only be used in conjunction with FileAccess.Write. Any attempt to read fails and throws an ArgumentException. Create       Specifies that the operating system should create a new file. If the file already exists, it will be overwritten. This requires FileIOPermissionAccess.Write and FileIOPermissionAccess.Append. System.IO.FileMode.Create is equivalent to requesting that if the file does not exist, use CreateNew; otherwise, use Truncate. CreateNew       Specifies that the operating system should create a new file. This requires FileIOPermissionAccess.Write. If the file already exists, an IOException is thrown. Open       Specifies that the operating system should open an existing file. The ability to open the file is dependent on the the value specified by FileAccess. A System.IO.FileNotFoundException is thrown if the file does not exist. OpenOrCreate       Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess.Read, FileIOPermissionAccess.Read is required. If file access is FileAccess.ReadWrite and the file exists, FileIOPermissionAccess.Write is required. If file access is FileAccess.ReadWrite and the file does not exist, FileIOPermissionAccess.Append is required in addition to Read and Write. Truncate       Specifies that the operating system should open an existing file. Once opened, the file should be truncated so that its size is zero bytes. This requires FileIOPermissionAccess.Write. Attempts to read from a file opened with Truncate cause an exception.  Microsoft MSDN links   System.IO System.IO.filemode

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