ajax的学习，不会请教

仅供参考，vs2005下测试通过 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="TabPanel.aspx.cs" Inherits="Default2" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > 
<head runat="server"> 
    <title>无标题页 </title> 
</head> 
<body> 
    <form id="form1" runat="server"> 
        <ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"> 
        </ajaxToolkit:ToolkitScriptManager> 
        <div> 
            <ajaxToolkit:TabContainer ID="TabContainer1" runat="server" Width="260px" Height="150px"> 
            
                <ajaxToolkit:TabPanel ID="TabPanel1" runat="server" HeaderText="会展领域"> 
                <ContentTemplate> 
                    <asp:UpdatePanel ID="UpdatePanel1" runat="server"> 
                        <ContentTemplate> 
                            <asp:Label ID="Label1" runat="server" Text="Label"> </asp:Label> <br/> 
                                <br/> 
                                    <asp:Button ID="btnOK" runat="server"  Text="确定"/> 
                                </ContentTemplate> 
                            </asp:UpdatePanel> 
                </ContentTemplate> 
                </ajaxToolkit:TabPanel> 
                
                
                <ajaxToolkit:TabPanel ID="TabPanel2" runat="server" HeaderText="采办领域"> 
                    <ContentTemplate> 
                        <asp:UpdatePanel ID="UpdatePanel2" runat="server"> 
                                <ContentTemplate> 
                                    <asp:Label ID="Label2" runat="server" Text="Labe2"> </asp:Label> <br/> 
                                    <br/> 
                                    <asp:Button ID="Button1" runat="server"  Text="确定"/> 
                                </ContentTemplate> 
                          </asp:UpdatePanel> 
                    </ContentTemplate> 
                </ajaxToolkit:TabPanel> 
                
                
                <ajaxToolkit:TabPanel ID="TabPanel3" runat="server" HeaderText="单 片 机"> 
                <ContentTemplate> 
                    <br/> <br/>这是我第一个Tabs <br/> <br/> 
                  <ahref= http://blog.csdn.net/meng1986>meng </a> 
                </ContentTemplate> 
                </ajaxToolkit:TabPanel> 
                
            </ajaxToolkit:TabContainer> 
      </div> 
      
      <div> 
            <ajaxToolkit:TabContainer ID="TabContainer2" runat="server" Width="260px" Height="150px"> 
            
                <ajaxToolkit:TabPanel ID="TabPanel4" runat="server" HeaderText="会展领域"> 
                <ContentTemplate> 
                    <asp:UpdatePanel ID="UpdatePanel3" runat="server"> 
                        <ContentTemplate> 
                            <asp:Label ID="Label3" runat="server" Text="Label"> </asp:Label> <br/> 
                                <br/> 
                                    <asp:Button ID="Button2" runat="server"  Text="确定"/> 
                                </ContentTemplate> 
                            </asp:UpdatePanel> 
                </ContentTemplate> 
                </ajaxToolkit:TabPanel> 
                
                
                <ajaxToolkit:TabPanel ID="TabPanel5" runat="server" HeaderText="采办领域"> 
                    <ContentTemplate> 
                        <asp:UpdatePanel ID="UpdatePanel4" runat="server"> 
                                <ContentTemplate> 
                                    <asp:Label ID="Label4" runat="server" Text="Labe2"> </asp:Label> <br/> 
                                    <br/> 
                                    <asp:Button ID="Button3" runat="server"  Text="确定"/> 
                                </ContentTemplate> 
                          </asp:UpdatePanel> 
                    </ContentTemplate> 
                </ajaxToolkit:TabPanel> 
                
                
                <ajaxToolkit:TabPanel ID="TabPanel6" runat="server" HeaderText="单 片 机"> 
                <ContentTemplate> 
                    <br/> <br/>这是我第一个Tabs <br/> <br/> 
                  <ahref= http://blog.csdn.net/meng1986>meng </a> 
                </ContentTemplate> 
                
                </ajaxToolkit:TabPanel> 
            </ajaxToolkit:TabContainer> 
      </div> 
    </form> 
</body> 
</html> 
我运行这段代码时提示ajaxToolkit有错误。
不知道怎么办，在线等。