把Label中的内容保存到.doc文件，不要</span>的标记，要怎么做呢？

按照导出gridview的方法，倒出来的文档是这样的：
<span id="Label1">112233444</span>如果我要去掉<span id="Label1"></span>的标记，只要112233444，怎么实现呢？谢谢大家我的类的代码：        /// grid转word
        /// </summary>
        /// <param name="pa">页面HttpResponse输入</param>
        /// <param name="gridview">传入需要生成excel的gridview</param>
        /// <param name="filename">生成的文件名</param>
        /// <param name="path">生成的地址</param>
        public static void toword(System.Web.HttpResponse pa, System.Web.UI.WebControls.Label Label1, string filename, string path)
        {
            System.Web.HttpResponse httpresponse = pa;
            httpresponse.AppendHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8)); //filename="*.doc"; 
            httpresponse.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            httpresponse.ContentType = "application/msword";
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            Label1.RenderControl(hw);            string filepath = path + filename;
            System.IO.StreamWriter sw = System.IO.File.CreateText(filepath);
            sw.Write(tw.ToString());
            sw.Close();            httpresponse.End();
        }