ajax仿google搜索，数据显示不出来，请高手

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>输入自动完成</title>
    <script language="javascript">
        //输入信息的文本框
        var txtInput;
        //下拉表当前选中项的索引

        var currentIndex = -1;

        //初始化参数,和下拉表位置
        function initPar()
        {
            txtInput =document.getElementById("txtCompanyName");
            //设置下拉表相对于文本输入框的位置
            setPosition();
        }

        //设置下拉表相对于文本输入框的位置
        function setPosition()
        {
            var width = txtInput.offsetWidth;
            var left = getLength("offsetLeft");
            var top = getLength("offsetTop") + txtInput.offsetHeight;

            divContent.style.left = left + "px";
            divContent.style.top = top + "px";
            divContent.style.width = width + "px";
        }

      //获取对应属性的长度
        function getLength(attr)
        {
            var offset = 0;
            var item = txtInput;
            while (item)
            {
                offset += item[attr];
                item = item.offsetParent;
            }
            return offset;
        }         //自动完成
        function autoComplete()
        {
            //如果按下向上, 向下或回车
            if (event.keyCode == 38 || event.keyCode == 40 || event.keyCode == 13)
            {
                //选择当前项
                selItemByKey();
            }
            else //向服务器发送请求
            {
                //如果值为空
                if (txtInput.value== "")
                {
                    divContent.style.display='none';
                    return;
                }
                //恢复下拉选择项为 -1
                currentIndex = -1;                 //开始请求
                requestObj = new ActiveXObject("Microsoft.XMLHTTP");
                requestObj.onreadystatechange = displayResult;
                requestObj.open("POST", "AutoComplete.aspx?ts=" + new Date().toLocaleString(), true);
                requestObj.send(txtInput.value);
            }
        }

        //显示结果
        function displayResult()
        {
            if (requestObj.readyState == 4)
            {
                    showData();
                    divContent.style.display = "";
            }
        }

        //显示服务器返回的结果 ,并形成下拉表
        function showData()
        {
             //获取数据
            var doc = new ActiveXObject("MSXML2.DOMDocument.3.0");
            doc.loadXML(requestObj.responseText);


            //显示数据的xslt
            var docStyle = new ActiveXObject("MSXML2.FreeThreadedDOMDocument");
            docStyle.async = false;
            docStyle.load("list.xslt");

            var docTemplate = new ActiveXObject("MSXML2.XSLTemplate");
            docTemplate.stylesheet =docStyle;

            //通过xslt转换xml数据
            var processor =docTemplate.createProcessor();

            processor.input =doc;
            processor.transform();
            var res =processor.output;

            //显示转后后的结果
            divContent.innerHTML =res;
        }

        //通过键盘选择下拉项
        function selItemByKey()
        {
            //下拉表
            var tbl = document.getElementById("tblContent");
            if (!tbl)
            {
                return;
            }
            //下拉表的项数
            var maxRow = tbl.rows.length;
            //向上
            if (event.keyCode == 38 && currentIndex > 0)
            {
                currentIndex--;
            }
            //向下
            else if (event.keyCode == 40 && currentIndex < maxRow-1)
            {
                currentIndex++;
            }
            //回车
            else if (event.keyCode == 13)
            {
                selValue();
                return;
            }

            clearColor();
            txtInput.value = tbl.rows[currentIndex].innerText;
            //设置当前项背景颜色为blue 标记选中
            tbl.rows[currentIndex].style.backgroundColor = "InfoBackground";
        }

        //清除下拉项的背景颜色
        function clearColor()
        {
            var tbl = document.getElementById("tblContent");
            for (var i = 0; i < tbl.rows.length; i++)
            {
                    tbl.rows[i].style.backgroundColor = "";
            }
        }

        //选择下拉表中当前项的值 ,用于按回车或鼠标单击选中当前项的值
        function selValue()
        {
            if (event.keyCode != 13)
            {
                var text = event.srcElement.innerText;
                txtInput.value = text;
            }
            initList();
        }

        //文本框失去焦点时设置下拉表可见性
        function setDisplay()
        {
            //获取当前活动td的表格
            if (document.activeElement.tagName == "TD")
            {
                var tbl = document.activeElement.parentElement.parentElement.parentElement;
                //如果不是下拉表,则隐藏下拉表
                if (tbl.id != "tblContent")
                {
                    initList();
                }
                return;
            }

            initList();

        }

        function initList()
        {
            divContent.style.display='none';
            divContent.innerHTML = "";
            currentIndex = -1;
        }
    </script>
</head>
<body onload="initPar();">
<form runat="server">
CompanyName<input type="text" id="txtCompanyName" onkeyup="autoComplete()" onblur="setDisplay();" style="width:400px"/>

<div id="divContent" style="display:none; position:absolute; ">
</div>
</form>
</body>
</html>AutoComplete.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AutoComplete.aspx.cs" Inherits="AutoComplete" %>
AutoComplete.aspx.csusing System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Text;
using System.IO;
public partial class AutoComplete : System.Web.UI.Page
{
    private static string conString = "server=fhj-2edfb3d5c20\\sql2005;uid=sa;pwd=1;database=book09";
    protected void Page_Load(object sender, EventArgs e)
    {
        string input = GetInput();
        Response.Write(GetCompanyName(input));
    }
    private string GetInput()
    {
        Stream s = Request.InputStream;
        int count = 0;
        byte[] buffer = new byte[1024];
        StringBuilder builder = new StringBuilder();
        while ((count = s.Read(buffer, 0, 1024)) > 0)
        {
            builder.Append(Encoding.UTF8.GetString(buffer, 0, count));
        }        return builder.ToString();
    }    private string GetCompanyName(string input)
    {
        using (SqlConnection con = new SqlConnection(conString))
        {
            SqlCommand command = new SqlCommand("select username from UserInfo where Username like '"+input+"%'", con);
            //command.Parameters.Add(new SqlParameter("@name", input + "%"));
            SqlDataAdapter adapter = new SqlDataAdapter(command);
            DataSet ds = new DataSet();
            adapter.Fill(ds);
            return ds.GetXml();
        }
    }
}
list.xslt<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html"/>
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="NewDataSet">
<table id="tblContent" style="background-color:GrayText">
<xsl:for-each select="Table">
<tr>

<td onclick="selValue()" style="cursor:hand" onmouseover="clearColor();this.parentElement.style.backgroundColor='InfoBackground'" onmouseout="clearColor()">
<xsl:value-of select="CompanyName"/>
</td>
</tr>
</xsl:for-each>
</table>
</xsl:template>
</xsl:stylesheet>
数据都返回来了，就是在 showData()方法里把数据填充到div中时，只有空的框架，没有数据

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