ignore folders/files directory.getfiles() denied access

i am perplexing arrangement list files found comparison office (and optionally any subdirectories). problem i am carrying getfiles() slight comes opposing folder can't access, throws an difference slight stops.

how i replace difference (and replace stable folder/file) continue adding permitted files list?

try
{
    (cbsubfolders.checked == false)
    {
        string[] files = directory.getfiles(folderbrowserdialog1.selectedpath);
        foreach (string filename files)
            processfile(filename);
    }
    else
    {
        string[] files = directory.getfiles(folderbrowserdialog1.selectedpath, "*.*", searchoption.alldirectories);
        foreach (string filename files)
            processfile(filename);
    }
    lblnumberoffilesdisplay.enabled = true;
}
catch (unauthorizedaccessexception) { }
finally {}