从“Silverlight”，怎样获取这个HTML元素中的值？该如何处理

private void Button_Click(object sender, RoutedEventArgs e)
{
    HtmlDocument doc = HtmlPage.Document;
    HtmlElement div = doc.GetElementById("myDIV");
    div.SetStyleAttribute("background", "green");
}

------解决方案--------------------
SL中也可以使用JS的。。

------解决方案--------------------
C# code

<object id="SL" data="data:application/x-silverlight-2," type="application/x-silverlight-2"
       width="100%" height="800px">
      <param name="source" value="../ClientBin/XXX.xap" />
      <param name="onError" value="onSilverlightError" />
      <param name="background" value="white" />
      <param name="minRuntimeVersion" value="4.0.60310.0" />
      <param name="autoUpgrade" value="true" />
      <param name="windowless" value="true" />
      <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0.60310.0" style="text-decoration: none">
      <img src="http://go.microsoft.com/fwlink/?LinkId=161376" alt="获取 Microsoft Silverlight"
                                            style="border-style: none" />
      </a>
</object>

<script type="text/javascript" language="javascript">
        function getMess(str) {
            $.post("Default.aspx", {
                "action": "search",
                "param": str
            }, function (data) {
                if (data.toString().indexOf("Longin.aspx") > -1) {
                    window.top.location.href = '../Longin/Longin.aspx';
                }
                setTimeout(function () {
                    var slHost = document.getElementById("SL");
                    var page = slHost.Content.Page;
                    page.process(data);
                }, 1000);
            });
        }
    </script>

using AjaxPro;

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                if (Request["action"] != null)
                {
                    if (Request["param"] != null)
                    {
                        System.Web.Script.Serialization.JavaScriptSerializer jss = new System.Web.Script.Serialization.JavaScriptSerializer();
                        StringBuilder sb = new StringBuilder();
                        sb.Append(Request["param"].ToString());
                        string strs = jss.Serialize(sb.ToString());
                        Response.Write(sb.ToString());
                        Response.End();
                    }
                }
            }
            AjaxPro.Utility.RegisterTypeForAjax(typeof(Default));
        }

Silverlight
using System.Json;
using System.Collections.ObjectModel;

namespace MapClient
{
       public MainPage()
        {
            InitializeComponent();
            //和aspx页面相互交互
            HtmlPage.RegisterScriptableObject("Page", this);
        }

        //和宿主aspx页面交互的函数
        [ScriptableMember]
        public void process(string arg)
        {
            //这个arg就是SL从html页面中传递过来的值
        }