数据库备份


        private void 数据备份ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //数据备份:  
            
            SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
            SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
            try
            {
                oSQLServer.LoginSecure = false;
                oSQLServer.Connect("10.14.114.125\\SQLEXPRESS", "sa", "123456 ");
                oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
                oBackup.Database = "building";
                //备份路径 
                oBackup.Files = @"d:\building.bak ";
                oBackup.BackupSetName = "building";
                oBackup.BackupSetDescription = "数据库备份 ";
                oBackup.Initialize = true;
                oBackup.SQLBackup(oSQLServer);
            }
            catch
            {
                throw;
            }
            finally
            {
                oSQLServer.DisConnect();
            } 
        }
点击备份按钮以后，在主程序入口那边报错，如图
哪位高手知道呀