private string MakeDirName(string dirname)
{
string retval = dirname;
retval = retval.Replace(@"\", "");
retval = retval.Replace(@"/", "");
retval = retval.Replace(@":", "");
retval = retval.Replace(@"*", "");
retval = retval.Replace(@"?", "");
retval = retval.Replace(@">", "");
retval = retval.Replace(@"<", "");
retval = retval.Replace(@"|", "");
return retval;
}