private DataTable importColumn (DataTable source,DataTable destination, string filter)
    {
        if (source == null || filter == null || filter.Trim() == "")
            throw new ArgumentException();
        if (source.Columns.Count != filter.Length)
            throw new ArgumentException();
        try
        {
            //creo la struttura dati
            List<string> colonne = new List<string>();
            for (int i = 0; i < filter.Length; i++)
                if (filter[i] == Convert.ToChar("1"))
                {
                    destination.Columns.Add(new DataColumn(source.Columns[i].ColumnName));
                    Scolonne.Add(source.Columns[i].ColumnName);
                }
            destination.AcceptChanges();
            //sincronizzo i dati
            foreach (DataRow dr in source.Rows)
            {
                DataRow newRow = destination.NewRow();
                foreach (string nomeColonna in colonne)
                    newRow[nomeColonna] = dr[nomeColonna];
                destination.Rows.Add(newRow);
            }
            destination.AcceptChanges();
            return (destination.Rows.Count == 0 || destination.Columns.Count == 0) ? null : destination;
        }
        catch { return null; }
    }