1、先打开Access数据库，建立如图所示的表：
2、打开VS新建WebForm1.aspx窗体和WebService1.asmx窗体。
3、在WebService1.asmx后台代码中添加以下方法：
（和SQL连接一样先把[System.Web.Script.Services.ScriptService]的注释撤销）
在WebService1.asmx添加一个getText方法
[WebMethod] public string[] getText(string prefixText, int count) { string[] auto = null; if (string.IsNullOrEmpty(prefixText) == true || count <= 0) return null; if (auto == null) { OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath(".\\App_Data\\Text.mdb")); string strsql = "select address from Address where address like '%" + prefixText + "%'"; OleDbCommand cmd = new OleDbCommand(strsql, conn); conn.Open(); OleDbDataReader dr = cmd.ExecuteReader(); ArrayList list = new ArrayList(); while (dr.Read()) { list.Add(dr[0].ToString()); } dr.Close(); string[] temp = new string[list.Count]; int i = 0; foreach (string s in list) { temp[i++] = s; } auto = temp; } return auto; }
4、在WebForm1.aspx窗体中添加ScriptManager控件、TextBox控件、AutoCompleteExtender控件，源代码如下所示：
WebForm1.aspx源码
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:AutoCompleteExtender ID="TextBox1_AutoCompleteExtender" runat="server"
MinimumPrefixLength="1" TargetControlID="TextBox1" ServiceMethod="getText" ServicePath="~/WebService1.asmx" CompletionSetCount="14" FirstRowSelected="True">
</asp:AutoCompleteExtender>
<br />
</form>
</body>
5、在浏览器中查看如图所示：
