.AClass{
     font-size: 12pt;
     
     }

------解决方案--------------------
http://topic.csdn.net/u/20090420/10/1aa0046b-db68-4cf7-98de-d4733c418fca.html

------解决方案--------------------

<asp:DropDownList runat="server" ID="XXXXXXX" Font-Size="14" Font-Italic="true" ForeColor="Red" Font-Bold="true">
           <asp:ListItem Value="aaa" Text="aaa" Selected="True" />
           <asp:ListItem Value="bbb" Text="bbb" />
       </asp:DropDownList>