当鼠标移动到指定的位置时，在不影响其他的元素的情况下出现一个菜单，并允许用户进行一些操作。
属性：
TargetControlID:要显示菜单的目标控件的ID
PopupControlID:作为弹出菜单的控件的ID
HoverCssClass:鼠标移动到目标控件时目标控件的样式
PopupPosition:弹出菜单所在的位置，共有五个值(bottom,top,left,right,center)
OffsetX:菜单距离目标控件的位置--横坐标
OffsetY:菜单距离目标控件的位置--纵坐标
PopDelay:弹出菜单的延迟时间
代码实例：
<body onload="focus();"> <center> 请移动鼠标到某一行数据上，以便看到<strong>“停靠菜单（HoverMenu）”</strong>。 <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False" DataKeyNames="员工号码" DataSourceID="SqlDataSource1" PageSize="5"> <Columns> <asp:TemplateField> <EditItemTemplate>
<%-- 存放编辑项目样板的容器 --%>
<asp:Panel ID="panEdit" runat="server"> <table> <tr> <td width="100"> <asp:Label ID="Label1" runat="server" Text='<%# Eval("员工号码") %>'></asp:Label> </td> <td width="100"> <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("姓名") %>' width="90"></asp:TextBox> </td> <td width="50"> <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("性别") %>' width="40"></asp:TextBox> </td> <td width="100"> <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("邮政编码") %>' width="90"></asp:TextBox> </td> <td width="450"> <asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("地址") %>' width="440"></asp:TextBox> </td> </tr> </table> </asp:Panel> <%-- 存放停驻选单（HoverMenu）的容器 --%> <asp:Panel ID="panHoverMenu" runat="server" width="50px" CssClass="cssHoverMenu"> <div style="padding: 2px; border: purple 2px dashed; text-align: center;"> <asp:LinkButton ID="lnkbtnUpdate" runat="server" CommandName="Update">更新</asp:LinkButton><br /> <asp:LinkButton ID="lnkbtnCancel" runat="server" CommandName="Cancel">取消</asp:LinkButton> </div> </asp:Panel> <%-- 指定停驻选单（HoverMenu）的属性 --%> <ajaxToolkit:HoverMenuExtender ID="hmeEdit" runat="server" TargetControlID="panEdit" PopupControlID="panHoverMenu" PopupPosition="Right" PopDelay="50" OffsetX="-10" OffsetY="5" HoverCssClass="cssRowHover"> </ajaxToolkit:HoverMenuExtender> <%-- 确认按钮（ConfirmButton） --%> <ajaxToolkit:ConfirmButtonExtender ID="cbeUpdate" runat="server" TargetControlID="lnkbtnUpdate" ConfirmText="确定要更新吗？"> </ajaxToolkit:ConfirmButtonExtender> </EditItemTemplate> <ItemTemplate> <%-- 存放项目样板的容器 --%> <asp:Panel ID="panItem" runat="server"> <table> <tr> <td width="100"> <asp:Label ID="Label1" runat="server" Text='<%# Eval("员工号码") %>'></asp:Label> </td> <td width="100"> <asp:Label ID="Label2" runat="server" Text='<%# Bind("姓名") %>'></asp:Label> </td> <td width="50"> <asp:Label ID="Label3" runat="server" Text='<%# Bind("性别") %>'></asp:Label> </td> <td width="100"> <asp:Label ID="Label4" runat="server" Text='<%# Bind("邮政编码") %>'></asp:Label> </td> <td align="left" width="450"> <asp:Label ID="Label5" runat="server" Text='<%# Bind("地址") %>'></asp:Label> </td> </tr> </table> </asp:Panel> <%-- 存放停驻选单（HoverMenu）的容器 --%> <asp:Panel ID="panHoverMenu" runat="server" width="50px" CssClass="cssHoverMenu"> <div style="padding: 2px; border: purple 2px dashed; text-align: center;"> <asp:LinkButton ID="lnkBtnEdit" runat="server" CommandName="Edit">编辑</asp:LinkButton><br /> <asp:LinkButton ID="lnkBtnDel" runat="server" CommandName="Delete">删除</asp:LinkButton> </div> <%-- 指定停驻选单（HoverMenu）的属性 --%> <ajaxToolkit:HoverMenuExtender ID="hmeItem" runat="server" TargetControlID="panItem" PopupControlID="panHoverMenu" PopupPosition="Left" PopDelay="50" OffsetX="10" OffsetY="-5" HoverCssClass="cssRowHover"> </ajaxToolkit:HoverMenuExtender> <%-- 确认按钮（ConfirmButton） --%> <ajaxToolkit:ConfirmButtonExtender ID="cbeDelete" runat="server" TargetControlID="lnkBtnDel" ConfirmText="确定要删除吗？"> </ajaxToolkit:ConfirmButtonExtender> </asp:Panel> </ItemTemplate> <HeaderTemplate> <table> <tr> <td colspan="5" align="center" bgcolor="#ccffff"> <font color="black" size="+2"><strong>员工信息列表</strong></font> </td> </tr> <tr bgcolor="#cc00ff"> <td align="center" width="100px"> <font color="white"><strong>员工号码</strong></font></td> <td align="center" width="100px"> <font color="white"><strong>姓名</strong></font> </td> <td align="center" width="50px"> <font color="white"><strong>性别</strong></font> </td> <td align="center" width="100px"> <font color="white"><strong>邮政编码</strong></font> </td> <td align="center" width="450px"> <font color="white"><strong>地址</strong></font> </td> </tr> </table> </HeaderTemplate> </asp:TemplateField> </Columns> <AlternatingRowStyle BackColor="#FFF0C0" /> </asp:GridView> </ContentTemplate> </asp:UpdatePanel> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConflictDetection="CompareAllValues" ConnectionString="<%$ ConnectionStrings:Northwind %>" DeleteCommand="DELETE FROM Employee WHERE EmployID = @original_EmployID AND UserName = @original_UserName AND Sex = @original_Sex AND MailCode = @original_MailCode AND Address = @original_Address" InsertCommand="INSERT INTO Employee (UserName, Sex, MailCode, Address) VALUES (@UserName, @Sex, @MailCode, @Address)" OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT EmployID, UserName, Sex, MailCode, Address FROM Employee" UpdateCommand="UPDATE Employee SET UserName = @UserName, Sex = @Sex, MailCode = @MailCode, Address = @Address WHERE EmployID = @original_EmployID AND UserName = @original_UserName AND Sex= @original_Sex AND MailCode = @original_MailCode AND Address = @original_Address"> <DeleteParameters> <asp:Parameter Name="original_EmployID" Type="Int32" /> <asp:Parameter Name="original_UserName" Type="String" /> <asp:Parameter Name="original_Sex" Type="String" /> <asp:Parameter Name="original_MailCode" Type="String" /> <asp:Parameter Name="original_Address" Type="String" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="UserName" Type="String" /> <asp:Parameter Name="Sex" Type="String" /> <asp:Parameter Name=MailCode" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="original_EmployID" Type="Int32" /> <asp:Parameter Name="originalUserName" Type="String" /> <asp:Parameter Name="original_Sex" Type="String" /> <asp:Parameter Name="original_MailCode" Type="String" /> <asp:Parameter Name="original_Address" Type="String" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name="UserName" Type="String" /> <asp:Parameter Name="Sex" Type="String" /> <asp:Parameter Name="MailCode" Type="String" /> <asp:Parameter Name="Address" Type="String" /> </InsertParameters> </asp:SqlDataSource> </form> </center></body>运行结果：
当鼠标移到数据行上时显示如下：
移到第4条记录上，单击"编辑"后，
单击确定后，就把记录更新。否则，放弃修改。