Windows Application Hang

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Windows

Hi Developers

I have the below code that restrict access on the following folders:
VSmart3,
ClientData and
Registers

But when the app gets to this line of code: directoryInfo.SetAccessControl(dirSecurity);
it hangs, and I can't figure it out why. I just want to know what could be the cause of this or maybe I'm doing something wrong there please help.

private static void SetFolderPermission(DirectoryInfo directoryInfo)
{
    var dirSecurity = directoryInfo.GetAccessControl();
    dirSecurity.AddAccessRule(new FileSystemAccessRule(WindowsIdentity.GetCurrent().Name,
                                                    FileSystemRights.Write,
                                                    AccessControlType.Deny));
    directoryInfo.SetAccessControl(dirSecurity);
}

private static void RestrictFolderWritablePermission()
{
  var folderNames = AppUtil.GetClientDataFolder(AppUtil.ResourceType.Registers).Replace('\\', ',').Split(',').ToArray();
  foreach (var folderName in folderNames)
  {
      if (!folderName.IsNullOrEmpty())
      {
          switch (folderName)
          {
              case "VSmart3":
                  var vSmart3Folder = AppUtil.GetClientDataFolder(AppUtil.ResourceType.Registers).Substring(0, 27);
                  SetFolderPermission(new DirectoryInfo(vSmart3Folder));
                  break;
              case "ClientData":
                  var clientDataFolder = AppUtil.GetClientDataFolder(AppUtil.ResourceType.Registers).Substring(0, 38);
                  SetFolderPermission(new DirectoryInfo(clientDataFolder));
                  break;
              case "Registers":
                  var registerFolder = AppUtil.GetClientDataFolder(AppUtil.ResourceType.Registers).Substring(0, 48);
                  SetFolderPermission(new DirectoryInfo(registerFolder));
                  break;
          }
      }
  }

}

Your help is much appreciated

Kindest Regards
Lucky Khoza