Asp.net Ajax 服务器控件使用 --- 2.AlwaysVisibleControl

AlwaysVisibleControl Demonstration

 <asp:ScriptManager id="ScriptManager" runat="server" EnablePartialRendering="true" />
    <div class="demoarea">
        <div class="demoheading">AlwaysVisibleControl Demonstration</div>
        <asp:UpdatePanel ID="update" runat="server">
            <ContentTemplate>
                <div style="width:230px;height:100px">
                    <asp:Panel ID="timer" runat="server"
                        Width="220px" BackColor="White" ForeColor="DarkBlue"
                        BorderWidth="2" BorderStyle="solid" BorderColor="DarkBlue" style="z-index: 1;">
                        <div style="width: 100%; height: 100%; vertical-align: middle; text-align: center;"><p>Current Time:</p><span id="currentTime" runat="server" style="font-size:xx-large;font-weight:bold;line-height:40px;"/></div>
                    </asp:Panel>
                    <ajaxToolkit:AlwaysVisibleControlExtender ID="avce" runat="server"
                            TargetControlID="timer"
                            VerticalSide="Top" VerticalOffset="10"
                            HorizontalSide="Right" HorizontalOffset="10"
                            ScrollEffectDuration=".1" />
                </div>
                <p>
                Choose a position for the clock from the list below, then scroll your browser window to see the demo.  
                </p>
                <p>
                
                Position: <asp:DropDownList ID="ddlPosition" runat="server" 
                    AutoPostBack="true" OnSelectedIndexChanged="OnChange">
                    <asp:ListItem Text="Default" Selected="true"  Value="None" />
                    <asp:ListItem Text="Top Left" Value="TL" />
                    <asp:ListItem Text="Top Center" Value="TC" />
                    <asp:ListItem Text="Top Right"  Value="TR" />
                    <asp:ListItem Text="Middle Left" Value="ML" />
                    <asp:ListItem Text="Middle Center" Value="MC" />
                    <asp:ListItem Text="Middle Right"  Value="MR" />
                    <asp:ListItem Text="Bottom Left" Value="BL" />
                    <asp:ListItem Text="Bottom Center" Value="BC" />
                    <asp:ListItem Text="Bottom Right" Value="BR" />
                </asp:DropDownList>
                </p>
                
            </ContentTemplate>
         </asp:UpdatePanel>
>

对应的后台代码：

 protected void Page_Load(object sender, EventArgs e)
    }