可能是进度条的问题，高手帮我SEE SEE

public static void DbBackup(DelegateStep delegateStep, SqlConnection DBCon, string Filename, string Company)
        {
            SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
            SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
            try
            {
                oSQLServer.LoginSecure = false;
                //    oSQLServer.Connect(DBCon.DababaseServer,DBCon.SuperUserID,DBCon.SuperPassword);
                oSQLServer.Connect("127.0.0.1", "sa", "sql");
                oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
                oBackup.Database = Company;
                oBackup.Files = Filename;
                oBackup.BackupSetName = Company;
                oBackup.BackupSetDescription = "数据库备份";
                oBackup.Initialize = true;
                //进度条
                SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(delegateStep);
                oBackup.PercentComplete += pceh;                oBackup.SQLBackup(oSQLServer);
            }
            catch (Exception err)
            {
                throw (new Exception("备份数据库失败" + err.Message));
            }
            finally
            {
                oSQLServer.DisConnect();
            }
        }
提示：        public static void DbBackup(DelegateStep delegateStep, SqlConnection DBCon, string Filename, string Company)中DelegateStep未引用空间  应该怎么改呢？？