I run a script in win 7 Enterprise it worked but not in window 8.1

Question

I run a script that hides folders and it worked in window 7 Enterprise, but then when I tried it in window 8.1 it did not work at all. Is there something I am missing ?
public void StartDir()
DirectoryInfo dii;
String discT = @"C:\\Test0137";
String disc1 = discT + @"\NotePsn";
dii = Directory.CreateDirectory(disc1);
ToggleHidden(disc1);
public void ToggleHidden(string filename)
string path = filename;
DirectoryInfo di = Directory.CreateDirectory(path);
di.Attributes = FileAttributes.Directory | FileAttributes.Hidden;

Answer 1

Following the suggestion from Thomas, I modified my script. It worked perfectly on my Window 7 Enterprise.Then I just took my flash-memory(where my script reside) and plugged it in my laptop (window 8.1) and started to run the script but it did not hide
the directory I intended to hide, and I did not get any  error message either. I also tried to generate directories in different discs ...still it did not work. This Script is the corrected version after the suggestion of Thomas and Michael Taylor:
public void StartDir()
DirectoryInfo dii;
String discT = @"C:\\Test0137";
String disc1 = discT + @"\NotePsn";
dii = Directory.CreateDirectory(disc1);
ToggleHidden(disc1);
public void ToggleHidden(string filename)
string path = filename;
DirectoryInfo di = new DirectoryInfo (path);
di.Attributes = FileAttributes.Directory | FileAttributes.Hidden;