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  FileAccess  Enumeration 
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  System.IO.FileMode Enumeration
 
 Description
Calling writeTextBlock 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. After writeTextBlock
 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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