该字符串未被识别为有效的 DateTime。

453:                    {
行 454:                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
行 455:                        int rows = cmd.ExecuteNonQuery(); 显示出错在这里
行 456:                        cmd.Parameters.Clear();
行 457:                        return rows;
                         }
 xiaojin.Member MenmberDal = new xiaojin.Member();
        MenmberDal.ID = Convert.ToInt32(BasePage.LoginUserID);
        MenmberDal.Birthday = Convert.ToDateTime(tbBirthDay.Text);问题产生在这里
        MenmberDal.QQ = ChenYing.chenying.CheckStr(tbQQ.Text.Trim());
        MenmberDal.Email = ChenYing.chenying.CheckStr(tbEmail.Text.Trim());
        MenmberDal.HeadPicUrl = path;
        MenmberDal.Sex = ltr_sex.Text.ToString();
        MenmberDal.Tel = ChenYing.chenying.CheckStr(tbTel.Text.Trim());
        MenmberDal.TrueName = ChenYing.chenying.CheckStr(tbTrueName.Text.Trim());