下载的问题

public void ExporPhonelist(int taskid)
        {
            DataTable dt = new BLL.SMS_PhoneList().GetExportDataByTaskId(taskid).Tables[0];
            string strFileName;            //生成文件名: 当前年月日小时分钟秒+ 随机数
            Random rd = new Random(int.Parse(DateTime.Now.ToString("MMddhhmmss")));
            strFileName = DateTime.Now.ToString("yyyyMMdd")
                + DateTime.Now.Hour
                + DateTime.Now.Minute
                + DateTime.Now.Second
                + rd.Next(999999).ToString()
                + ".csv";
            StringWriter sw = new StringWriter();            string title = string.Empty;
            string content = string.Empty;
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                if (title == "")
                {
                    title = dt.Columns[i].ToString();
                    continue;
                }
                title = title + "," + dt.Columns[i].ToString();
            }
            string[] titlearray = title.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
            sw.WriteLine(title);
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                for (int j = 0; j < titlearray.Length; j++)
                {
                    if (content == "")
                    {
                        content = dt.Rows[i][j].ToString();
                        continue;
                    }
                    content += "," + dt.Rows[i][j].ToString();                }
                sw.WriteLine(content);
                content = string.Empty;
            }            sw.Close();            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(strFileName));            Response.ContentType = "vnd.ms-excel.numberformat:yyyy-MM-dd ";            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");            Response.Write(sw);            Response.End();
        }/*
* 这是我一个导出数据为Execl表格的方法  
*点击按钮 时导出  会自动弹出迅雷  在ie和ff里面 下载的是当前的页面  在360里面就是execl
*这个怎么解决？
*/