how to use Autocomplete extender at server side in c#.

Question

Hi, I want to set text box properties to dynamically created texbox. But don't know how to apply the animation to the extender control. I want to perform :

<%-- Make the completion list transparent and then show it --%>

                        <%--Cache the original size of the completion list the first time
                            the animation is played and then set it to zero --%>
                        <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';
                                            }" />

                        <%-- Expand from 0px to the appropriate size while fading in --%>
                        <Parallel Duration=".4">
                            <FadeIn />
                            <Length PropertyKey="height" StartValue="0" EndValueScript="$find('AutoCompleteEx')._height" />
                        </Parallel>
                    </Sequence>
                </OnShow>
                <OnHide>
                    <%-- Collapse down to 0px and fade out --%>
                    <Parallel Duration=".4">
                        <FadeOut />
                        <Length PropertyKey="height" StartValueScript="$find('AutoCompleteEx')._height" EndValue="0" />
                    </Parallel>
                </OnHide>
            </Animations>

At se rver side . bu t not getting any way.please guide. Still I have code :

autoComplete = new AutoCompleteExtender(); autoComplete.ID = "AutoComplete"; autoComplete.TargetControlID = "SelectEmployeeTextBox"; autoComplete.ServicePath = "~/AutoComplete.asmx"; autoComplete.ServiceMethod = "GetCompletionList"; autoComplete.MinimumPrefixLength = 2; autoComplete.CompletionInterval = 1000; autoComplete.EnableCaching = true; autoComplete.CompletionSetCount = 20; autoComplete.CompletionListCssClass = "autocomplete_completionListElement"; autoComplete.CompletionListItemCssClass = "autocomplete_listItem"; autoComplete.CompletionListHighlightedItemCssClass = "autocomplete_highlightedListItem"; autoComplete.DelimiterCharacters = ";, :"; autoComplete.ShowOnlyCurrentWordInCompletionListItem = true;