自定义方法：根据身份证账号获取出生日期

        #region 根据身份证获取出生日期
        /// <summary>
        /// 根据身份证获取出生日期
        /// </summary>
        /// <param name="Card"></param>
        /// <returns></returns>
        private DateTime GetBirthDayByCard(string Card)
        {
            try
            {
                if (Card.Trim().Length == 18 || Card.Trim().Length == 15)
                {
                    string data = Card.Trim().Length == 18 ? Card.Trim().Substring(6, 8) : "19" + Card.Trim().Substring(6, 6);
                    data = data.Substring(0, 4) + "-" + data.Substring(4, 2) + "-" + data.Substring(6, 2);
                    return DateTime.Parse(data);
                }
            }
            catch (Exception ex)
            {
                PageHelper.ShowMassage(this.Page, "身份证号输入有误！");
            }
            return new DateTime();
        }
        #endregion

自定义方法：根据身份证账号获取出生日期

原文：http://www.cnblogs.com/ment/p/7642383.html