连接数据库智能感知

前台代码：

<head runat="server">
    <title></title>
    <link href="js/jquery.autocomplete.css" rel="stylesheet" type="text/css" />
    <script src="js/Jquery1.7.js" type="text/javascript"></script>
    <script src="js/jquery.autocomplete.js" type="text/javascript"></script>
    <script src="js/jquery.autocomplete.pack.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $.ajax({
                type: "post",
                contentType: "application/json",
                url: "WebService1.asmx/getGoods",
                data: "{}",
                success: function (result) {
                    var array = new Array();
                    for (var i = 0; i < result.d.length; i++) {
                        array.push(result.d[i]);
                    }
                    $('#txtQuery').autocomplete(array);
                }
            })
        })

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtQuery" runat="server"></asp:TextBox>
    </div>
    </form>
</body>

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namespace WebApplication1
{
    /// <summary>
    /// WebService1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
     [System.Web.Script.Services.ScriptService]
    public class WebService1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string HelloWorld()
        {
            return "Hello World";
        }

        [WebMethod]
        public List<string> getGoods()
        {
            List<string> list = new List<string>();
            if (Context.Cache["goods"] == null)
            {
                string conStr = ConfigurationManager.ConnectionStrings["strcon"].ConnectionString;
                SqlConnection conn = new SqlConnection(conStr);
                conn.Open();
                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = "select T_GoodsTitle from T_Goods";
                SqlDataReader reader = cmd.ExecuteReader();
                while (reader.Read())
                {
                    list.Add(reader["T_GoodsTitle"].ToString());
                }
                Context.Cache["goods"] = list;
            }
            else {
                list = Context.Cache["goods"] as List<string>;
            }
            return list;
        }