private RenewalPeriod ParseRenewalPeriod() { RenewalPeriod renewalPeriod = null; if (!string.IsNullOrEmpty(this.RenewalPeriod)) { var period = Int32.Parse(RenewalPeriod.Substring(0, 1)); var unit = RenewalPeriod.Substring(2); renewalPeriod = new RenewalPeriod(period, unit); } return(renewalPeriod); }