autocompleteextender 没有找到DelimiterCharacters的公共属性？


autocompleteextender 没有找到DelimiterCharacters的公共属性？
大家帮我看看错在哪里？
我只是把AjaxControlToolkit.dll和AjaxControlToolkit.pdb复制到项目的bin目录，
然后再工具栏添加一个标签，内容加入AjaxControlToolkit.dll，就直接使用autocompleteextender。这样布置环境有没有问题？
 <td align="left" width="30%">
                                    <asp:textbox id="txtCrsNam" onkeydown="enter()" runat="server" Width="216px" MaxLength="8"></asp:textbox>
<cc1:autocompleteextender 
runat="server" 
                                                        BehaviorID="AutoCompleteEx"
                                                        ID="autoComplete1" 
                                                        TargetControlID="txtCrsNam"
                                                        ServicePath="AutoCompleteCrsName.asmx" 
                                                        ServiceMethod="GetCompletionList"
                                                        MinimumPrefixLength="2" 
                                                        CompletionInterval="500"
                                                        EnableCaching="true"
                                                        CompletionSetCount="20" 
                                                        CompletionListCssClass="autocomplete_completionListElement" 
                                                        CompletionListItemCssClass="autocomplete_listItem" 
                                                        CompletionListHighlightedItemCssClass="autocomplete_highlightedListItem"
                                                        DelimiterCharacters=";,:">
                                                        
                                                        <Animations>
                                                            <OnShow>
                                                                <Sequence>
                                                                    <OpacityAction Opacity="0" />
                                                                    <HideAction Visible="true" />
                                                                    <ScriptAction Script="
                                                                        // Cache the size and setup the initial size
                                                                        var behavior = $find('AutoCompleteEx');
                                                                        if (!behavior._height) {
                                                                            var target = behavior.get_completionList();
                                                                            behavior._height = target.offsetHeight - 2;
                                                                            target.style.height = '0px';
                                                                        }" />
                                                                    <Parallel Duration=".4">
                                                                        <FadeIn />
                                                                        <Length PropertyKey="height" StartValue="0" EndValueScript="$find('AutoCompleteEx')._height" />
                                                                    </Parallel>
                                                                </Sequence>
                                                            </OnShow>
                                                            <OnHide>
                                                                
                                                                <Parallel Duration=".4">
                                                                    <FadeOut />
                                                                    <Length PropertyKey="height" StartValueScript="$find('AutoCompleteEx')._height" EndValue="0" />
                                                                </Parallel>
                                                            </OnHide></Animations>
                                        </cc1:autocompleteextender></td>