在datalist中显示不同颜色（方式）的列表

<asp:DataList ID="DataList1" runat="server">
    <ItemTemplate>
        <table align="center" border="0" cellpadding="0"
    cellspacing="0" width="620">
            <tr>
                <td colspan="2" height="8">
                </td>
            </tr>
            <tr>
                【<%#Exhibition(Eval("ID"))%>】将ID绑定出来写到用一个方法处理
            </tr>
            <tr>

                <td class="grayblack graydashed" width="480">
                    <%#Eval("City") %> | <%#DateFormat.ShortDate(Eval("BeginTime")) %> 到 <%#DateFormat.ShortDate(Eval("EndTime")) %></td>
                <td class="lightgreen graydashed" width="140">
                    <%#DateDiff(Eval("BeginTime"),Eval("EndTime"))%></td>
            </tr>
        </table>
    </ItemTemplate>
</asp:DataList>
<asp:DataList ID="DataList1" runat="server">
    <ItemTemplate>
        <table align="center" border="0" cellpadding="0"
    cellspacing="0" width="620">
            <tr>
                <td colspan="2" height="8">
                </td>
            </tr>
            <tr>
                【<%#Exhibition(Eval("ID"))%>】将ID绑定出来写到用一个方法处理
            </tr>
            <tr>

                <td class="grayblack graydashed" width="480">
                    <%#Eval("City") %> | <%#DateFormat.ShortDate(Eval("BeginTime")) %> 到 <%#DateFormat.ShortDate(Eval("EndTime")) %></td>
                <td class="lightgreen graydashed" width="140">
                    <%#DateDiff(Eval("BeginTime"),Eval("EndTime"))%></td>
            </tr>
        </table>
    </ItemTemplate>
</asp:DataList>

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//后台处理方法（返回想要显示的表格的数据及样式）

public string Exhibition(object ID)
    {

        int ExhibitionID = GetValue(ID);
        string sql = "SELECT IsRec FROM YD_TeaExhibitions WHERE ID=" + ExhibitionID +"ORDER BY IsRec DESC,AddTime DESC";
        DataSet ds = SqlProvider.ExecuteDataset(sql);
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            if (GetValue<bool>(ds.Tables[0].Rows[i]["IsRec"]) == true)
            {
                RecTrue = "<td colspan=\"2\"class=\"redb\">" + "<荐>"+ WebHelper.SubString(Eval("ExhibitionName").ToString(),SelectLength,false) +"</td>";
            }
            else
            {
                RecTrue = "<td colspan=\"2\"class=\"grayblackb\">" + WebHelper.SubString(Eval("ExhibitionName").ToString(),SelectLength,false) +"</td>";
            }
        }

        return RecTrue;

    }