for 循环 从数据库取数据，每5条数据后面有一个点划线样式。

 public string GetMarketsString(int pageSize,int pageIndex)
    {
        StringBuilder builder = new StringBuilder();
        List<MarketGoodsEntity> goods = MarketData.Instance.GetMarketGoodsAll(pageSize, pageIndex);
        for (int i = 0; i < goods.Count; i++)
        {
            MarketGoodsEntity good = goods[i];
            if (i % 5 == 4)
            {
                if (good.MarketFlag == 0)
                {
                    builder.Append(string.Format("<li class=\"clearfix articlesSep\"><a href=\"/Market/View.aspx?GoodsID={0}\" class=\"left\">{1}</a><em class=\"timeEm right\">{2}</em><span class=\"addSpan right\">{3}省 {4}</span></li>  \r\n",good.GoodsID,good.GoodsName,good.CreatedTime.ToString("yyyy-MM-dd"),good.ProvinceName,good.CityName));
                }
                else
                {
                    builder.Append(string.Format("<li class=\"buyArticle clearfix articlesSep\"><a href=\"/Market/View.aspx?GoodsID={0}\" class=\"left\">{1}</a><em class=\"timeEm right\">{2}</em><span class=\"addSpan right\">{3}省 {4}</span></li>  \r\n", good.GoodsID, good.GoodsName, good.CreatedTime.ToString("yyyy-MM-dd"), good.ProvinceName, good.CityName));
                }
            }
            else
            {
                if (good.MarketFlag == 0)
                {
                    builder.Append(string.Format("<li class=\"clearfix\"><a href=\"/Market/View.aspx?GoodsID={0}\" class=\"left\">{1}</a><em class=\"timeEm right\">{2}</em><span class=\"addSpan right\">{3}省 {4}</span></li>  \r\n", good.GoodsID, good.GoodsName, good.CreatedTime.ToString("yyyy-MM-dd"), good.ProvinceName, good.CityName));
                }
                else
                {
                    builder.Append(string.Format("<li class=\"buyArticle clearfix\"><a href=\"/Market/View.aspx?GoodsID={0}\" class=\"left\">{1}</a><em class=\"timeEm right\">{2}</em><span class=\"addSpan right\">{3}省 {4}</span></li>  \r\n", good.GoodsID, good.GoodsName, good.CreatedTime.ToString("yyyy-MM-dd"), good.ProvinceName, good.CityName));
                }
            }
            
        }
           
        return builder.ToString();
    }