esac - 1 year ago 111
C# Question

# How do I write to a hidden file?

I am using the TextWriter to try to write to a hidden file, and it is throwing an exception. I can't seem to figure out how to write to a hidden file.

``````using (TextWriter tw = new StreamWriter(filename))
{
tw.WriteLine("foo");
tw.Close();
}
``````

Exception:

``````Unhandled Exception: System.UnauthorizedAccessException:
Access to the path 'E:\*\media\Photos\2006-08\.picasa.ini' is denied.
``````

How can I write to a hidden file?

EDIT 2: This answer solve the problem, but is not the correct way to deal with the problem. You should look for Lucero's answer.

Took this answer from: http://www.dotnetspark.com/Forum/314-accessing-hidden-files-and-write-it.aspx

1- Set File as Visible so it can be overwritten

``````// Get file info
FileInfo myFile= new FileInfo(Environment.CurrentDirectory + @"\hiddenFile.txt");

// Remove the hidden attribute of the file
myFile.Attributes &= ~FileAttributes.Hidden;
``````

2- Make changes to the file

``````// Do foo...
``````

3- Set back file as hidden

``````// Put it back as hidden
myFile.Attributes |= FileAttributes.Hidden;
``````

EDIT: I fixed some problem on my answer as mentionned by briler

Recommended from our users: Dynamic Network Monitoring from WhatsUp Gold from IPSwitch. Free Download