搜索引擎如何实现自动搜索


如何实现这功能，求指导
------解决方案--------------------
google autocomplete ajax asp.net
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Refer:


http://www.cnblogs.com/insus/archive/2011/07/16/2108172.html
http://www.cnblogs.com/insus/archive/2013/03/28/2986217.html
http://www.cnblogs.com/insus/archive/2013/04/05/2986989.html
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use jquery autocomplete:

 $(function(){

            $("#<%=txtSfzh.ClientID %>").autocomplete("../services/SearchSyryInfoService.ashx",{

                width: 500,

                max: 20,

                delay: 20,

                cacheLength: 1,

                formatItem: function(data, i, max) {

                    return data.toString();

                },

                formatResult: function(data) {

                    return data.toString().split(",")[1];

                }

            }).result(function(event, data, formatted) {

                var array = data.toString().split(",");

                $("#<%=txtXm.ClientID %>").val(array[0]);//姓名