我通过循环 拼写的html字符串 将数据显示在控件Literal控件中，有谁知道如何对这些数据排序呀，要求按照价格，日期等排序，代码如下：

//单程
            if (D == true)
            {
                IList<FlightInfo> fi = dif.getSearchList(this.HiddenFrom.Value, this.Hiddento.Value, this.fromDate.Text);
                foreach (FlightInfo fl in fi)
                {
                    //转机次数
                    int intall = Convert.ToInt32(fl.ChangeTime);
                    //有中转（样式）
                    if (intall > 0)
                    {
                        strb.Append("<li><div class=\"noli1\"><p class=\"p1_1 magt\" >单<br />程</p></div><div class=\"con\">");
                        intTrans = intTrans+1;
                    }
                    else  //无中转
                    {
                        strb.Append("<li><div class=\"noli1\"><p class=\"p1_1\"  >单<br />程</p></div><div class=\"con\">");
                        intNonStop = intNonStop+1;
                    }
                   
                   
                    foreach (Segment se in fl.segments)
                    {
                        //出发时间
                        string h = se.Flights[0].FromTime.Substring(0, 2);
                        string m = se.Flights[0].FromTime.Substring(2, 2);

                        //到达时间
                        string h1 = se.Flights[0].ToTime.Substring(0, 2);
                        string m1 = se.Flights[0].ToTime.Substring(2, 2);

                        //飞行时长
                        string[] du = se.Flights[0].Duration.Split(':');
                        string hdu = du[0];
                        string mdu = du[1];

                            strb.Append("<p><span class=\"noli2\"><a href=\"#\">" + Conn.getAirCompany()[se.Flights[0].AirCo] + "</a></span><span class=\"noli3\">" + h + ":" + m + "&nbsp;&nbsp;" + Conn.getAirPortName()[se.Flights[0].FromAirport] + "</span><span class=\"noli4\">" + se.Flights[0].EquipType + "</span><span class=\"noli5\">" + hdu + "小时</span></p><p><span class=\"noli2\"><strong><a href=\"#\">" + se.Flights[0].FlightNumber + "</a></strong></span><span class=\"noli3\">" + h1 + ":" + m + "&nbsp;&nbsp;" + Conn.getAirPortName()[se.Flights[0].ToAirport] + "</span><span class=\"noli4\">（大）</span><span class=\"noli5\">" + mdu + "分钟</span></p>");
                            if (intall > 0)
                            {
                                strb.Append("<p ><span class=\"noli7\">中转</span></p>");
                                intall = intall - 1;
                            }
                       
                    }
                    if (intall > 1)
                    {
                        strb.Append("</div><div class=\"noli6 magt2\" ><p><span class=\"yahei\">￥</span><span class=\"jg2 orang \">" + fl.TotalFare + "</span></p><p>参考税<span class=\"yahei\">￥</span><span class=\"jg1\">" + fl.TotalTax + "</span></p><p><a href=\"#\"><img src=\"img/jp_yd.jpg\" width=\"80\" height=\"24\" /></a></p><p class=\"p3\"><a href=\"#\">更多相类似组合 <img src=\"img/jp_jt.jpg\" width=\"9\" height=\"8\" /></a></p></div></li>");
                    }
                    else
                    {
                        strb.Append("</div><div class=\"noli6\" ><p><span class=\"yahei\">￥</span><span class=\"jg2 orang \">" + fl.TotalFare + "</span></p><p>参考税<span class=\"yahei\">￥</span><span class=\"jg1\">" + fl.TotalTax + "</span></p><p><a href=\"#\"><img src=\"img/jp_yd.jpg\" width=\"80\" height=\"24\" /></a></p><p class=\"p3\"><a href=\"#\">更多相类似组合 <img src=\"img/jp_jt.jpg\" width=\"9\" height=\"8\" /></a></p></div></li>");
                    }
                }//" + dif.SentOrder(fl) + "
                this.Literal1.Text = strb.ToString();
                //统计显示最低价
                this.lbllowest.Text = fi[0].TotalFare;
               
            }