<asp:RadioButtonList runat="server" ID="rblShow" class="show"

                 RepeatDirection="Horizontal">

                 <asp:ListItem Text="是" value="1" />

                 <asp:ListItem Text="否" value="0"/>

   </asp:RadioButtonList>

 <p class="isShow" style="width: 500px">
                測試文字
 </p>

<script type="text/javascript">
         $(function () {
             $(":radio").click(function () {
                 if ($(this).val() == "1") {
                     $(".isShow").fadeIn();
                 } else {
                     $(".isShow").fadeOut();
                 }
             })
         })