[Member name] Create [Description] 
Specifies that the operating system should create a new file. If the file already exists, it will be overwritten. This operation requires FileIOPermissionAccess.Write permission. System.IO.FileMode.Create is equivalent to requesting that if the file does not exist, use CreateNew; otherwise, use Truncate. If the file already exists but is a hidden file, an UnauthorizedAccessException exception is thrown.