Asp.Net导出文件名中文乱码

protected void Page_Load(object sender, EventArgs e)
    {string html = “网页html代码”;
        string fileName = "故事.doc";
        DownloadDoc(fileName,html);
    }
    public void DownloadDoc(string fileName, string pageHtml)
    {
        //设置Http的头信息,编码格式  
        HttpContext.Current.Response.Buffer = true;
        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.Charset = "gb2312";
        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.ClearHeaders();
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
        HttpContext.Current.Response.ContentType = "application/ms-word";
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + clFielName(fileName));
        //关闭控件的视图状态  ,如果仍然为true，RenderControl将启用页的跟踪功能，存储与控件有关的跟踪信息
        this.EnableViewState = false;

        HttpContext.Current.Response.Write(pageHtml);
        HttpContext.Current.Response.End();
    }
    public string clFielName(string fileName)
    {
        System.Web.HttpContext curContext = System.Web.HttpContext.Current;
        string outputFileName = null;
        string browser = curContext.Request.UserAgent.ToUpper();
        if (browser.Contains("MS") == true && browser.Contains("IE") == true)
        {
            outputFileName = System.Web.HttpUtility.UrlEncode(fileName);
        }
        else if (browser.Contains("FIREFOX") == true)
        {
            outputFileName = "\"" + fileName + "\"";
        }
        else
        {
            outputFileName = System.Web.HttpUtility.UrlEncode(fileName);
        }
        return outputFileName;
    }