FileAccess Enumeration defines constants for read, write, or read/write access to a file.

Read

It defines read access to the file.  Data can be read from the file.  Combine with Write for read or write access.

ReadWrite

It defines read and write access to the file.  Data can be written to and read from the file. 

Write

It defines write access to the file.  Data can be written to the file.  Combine with Read for read or write access.