显示每个catergory中标题为粗体的下拉列表

Question

我有很多类别都有子项目。要使标题加粗。

在C＃的服务器端

   string filePath;
        filePath = Server.MapPath("~/Application.xml");
        DataSet ds1 = new DataSet();
        ds1.ReadXml(filePath);
        ddlApplication.DataSource = ds1.Tables["CD"];
        ddlApplication.DataTextField = "Application";
        ddlApplication.DataValueField = "Application";
        ddlApplication.DataBind();
        ddlApplication.Items.Insert(0, new ListItem("Select", "NA"));

客户端

<asp:DropDownList ID="ddlApplication" runat="server"  TabIndex="6"
                 class="form-control">
   </asp:DropDownList> 

我希望其中的一些标题是bold.ow我会这样做。我绑定XML

如下：

的Application.xml

<CATALOG>
 <CD>
    <ID>1</ID>
    <Application>'----------Financials---(Only header do not select this entry)</Application>
  </CD>
  <CD>
    <ID>2</ID>
    <Application>''DaisyPCD Passenger Business</Application>
  </CD>
</CATALOG>