public QryStringsCollection(String str)
        {
            String[]  arLst = str.Split('&');
            QryString qryStr;

            String[] arLstPair;
            foreach (String str1 in arLst)
            {
                arLstPair = str1.Split('=');
                qryStr    = new QryString(arLstPair[0], arLstPair[1]);
                this.Add(qryStr);
            }
        }
 public void Remove(QryString qs)
 {
     this.List.Remove(qs);
 }
 public void Add(QryString qs)
 {
     this.List.Add(qs);
 }