Asp.net中带进度条的批量静态页生成

namespace WDFROG.BLL
...{
    public delegate void CreateHtmlHandler(string fileName,string msg,int percent );
    public class News
    ...{
        private const string C_ERR_MSG = "You have no rights!";
        private const string C_CHK_NAME = "NewsManage";
        private static  string C_DIR = ConfigurationManager.AppSettings["NewsHtml"];
       
        public  event CreateHtmlHandler CompleteAFile;
        public static int Create(string AdminName,NewsInfo news)
        ...{
            IPermissionChecker chk = PermissionCheckerFactory.GetChecker(AdminName, C_CHK_NAME);
            chk.Check(C_ERR_MSG);
            news.HtmlFile =FileOperator.GetRandFileName(".html");
            int ret= NewsDAL.Create(news);
            CreateHtmlFile(news);
            return ret;
        }
        public static int DeleteByIdList(string AdminName,string IdList)
        ...{
            IPermissionChecker chk = PermissionCheckerFactory.GetChecker(AdminName, C_CHK_NAME);
            chk.Check(C_ERR_MSG);
            DataTable dt = SelectHtmlFileByIdList(IdList).Tables[0];
            string fileName = "";
            foreach (DataRow dr in dt.Rows)
            ...{
                if (!(dr[0] is DBNull))
                ...{
                    fileName = dr[0].ToString();
                    if(string.IsNullOrEmpty(fileName))
                    ...{
                      fileName = FileOperator.MapPath(C_DIR + fileName);
                      File.Delete(fileName);
                    }
                }
            }
            return NewsDAL.DeleteByIdList(IdList);

        }
        public static int DeleteByNewsID(string AdminName, int N