如何用DataList实现某一列如果超过特定长度就自动换行

<asp:datalist id="DataList1" runat="server" Width="280px" CellSpacing="5">
 <ItemTemplate>
           <%#DataBinder.Eval(Container.DataItem,"FileName").ToString().Length>16?DataBinder.Eval
           (Container.DataItem,"FileName").ToString().Replace("\n","").Replace("<","&lt;").Replace
           (">","&gt").Replace("\r","<br>").Replace(" ","&nbsp;").Substring(0,16):DataBinder.Eval
           (Container.DataItem,"FileName").ToString()%>
 </ItemTemplate>
</asp:datalist>