"To be sure"

WARNING: Every new object must be cleaned! (You have no idea who used it before :))

        DataTable dtPackages = new DataTable();

        if (dtPackages.Rows.Count > 0 || dtPackages.Columns.Count > 0)
        {
            dtPackages.Clear();
            dtPackages.Columns.Clear();
            dtPackages.Rows.Clear();
        }