25.TextBoxWatermark
   功能：文本水印
   细节： 没有什么说的看代码--->

 代码示意：
    <asp:TextBox ID="TextBox1" CssClass="unwatermarked" Width="150" runat="server"></asp:TextBox>
            <cc1:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" runat="server" TargetControlID="TextBox1" WatermarkText="请输入用户名" WatermarkCssClass="watermarked" />

26.UpdatePanelAnimation
   功能：更新动画效果
   细节：代码结构简单但是要说的东西很多，回头再说写专题吧

代码示意：
  <ajaxToolkit:UpdatePanelAnimationExtender ID="ae"
  runat="server" TargetControlID="up">
     <Animations>
        <OnUpdating>  </OnUpdating>
        <OnUpdated>  </OnUpdated>
    </Animations>
</ajaxToolkit:UpdatePanelAnimationExtender>

27.ToggleButton
   功能：就是把一个CheckBox的逻辑应用到一个按钮上，于是就有了双态按钮这么个玩意，有点意思啊
   闲言少叙，看代码：

<asp:CheckBox ID="CheckBox1" Checked="true" Text="I like ASP.NET" runat="server"/>
    <cc1:ToggleButtonExtender ID="ToggleButtonExtender1" runat="server" TargetControlID="CheckBox1" ImageWidth="19"
     ImageHeight="19" UncheckedImageUrl="Image/down.gif" CheckedImageUrl="Image/up.gif" CheckedImageAlternateText="Check"
     UncheckedImageAlternateText="UnCheck" />

28.ValidatorCallout
   功能：Windows系统中最常见的气泡提示，比如你磁盘空间不足的时候……
   细节： 是对数据验证控件的扩展，比较新鲜

代码示意：
 <asp:RequiredFieldValidator runat="server" ID="NReq" ControlToValidate="NameTextBox" Display="None" ErrorMessage="<b>Required Field Missing</b><br />A name is required." />
        <asp:RequiredFieldValidator runat="server" ID="PNReq" ControlToValidate="PhoneNumberTextBox" Display="None" ErrorMessage="<b>Required Field Missing</b><br />A phone number is required.<div style='margin-top:5px;padding:5px;border:1px solid #e9e9e9;background-color:white;'><b>Other Options:</b><br /><a href='javascript:alert(&quot;not implemented but you get the idea;)&quot;);'>Extract from Profile</a></div>" />
        <asp:RegularExpressionValidator runat="server" ID="PNRegEx" ControlToValidate="PhoneNumberTextBox" Display="None" ErrorMessage="<b>Invalid Field</b><br />Please enter a phone number in the format:<br />(###) ###-####" ValidationExpression="((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}" />
        <cc1:ValidatorCalloutExtender runat="Server" ID="NReqE" TargetControlID="NReq" HighlightCssClass="highlight" />
        <cc1:ValidatorCalloutExtender runat="Server" ID="PNReqE" TargetControlID="PNReq" HighlightCssClass="highlight" Width="350px" />
        <cc1:ValidatorCalloutExtender runat="Server" ID="PNReqEx" TargetControlID="PNRegEx" HighlightCssClass="highlight" />