protected void delmark(object sender, CommandEventArgs e) {
        string _id = e.CommandArgument.ToString();

        string str_conn = str_cnn + MapPath(str_sourcefile);
        cnn = new OleDbConnection(str_conn);
        cnn.Open();

        str_sql = "UPDATE t_series set se_delete=true where se_id=" + _id;
        cmd = new OleDbCommand(str_sql, cnn);

        cmd.ExecuteNonQuery();
        
        cnn.Close();

        ListView1.DataBind();

             }