public static bool addMembership(Membership m)
        {
            DBConnector dbcon = new DBConnector();

            try
            {
                if (dbcon.openConnection())
                {
                    MySqlCommand cmd = new MySqlCommand();
                    cmd.CommandText = "INSERT INTO membership (institute, post_name, method, member_id, contribution, begin_date, renewal_date, status, personal_payment, active_date_person, institutional_payment, active_date_insti, employee_idemployee) VALUES (N'" + m.institute + "', N'" + m.post_name + "', N'" + m.method + "', N'" + m.member_id + "', N'" + m.contribution + "', '" + m.getBegin_date().ToString("yyyy-MM-dd") + "', '" + m.getRenewal_date().ToString("yyyy-MM-dd") + "', N'" + m.status + "', " + m.personal_payment + ", '" + m.getActive_date_person().ToString("yyyy-MM-dd") + "', " + m.institutional_payment + ", '" + m.getActive_date_insti().ToString("yyyy-MM-dd") + "', " + Employee.employee_id + ")";
                    cmd.Connection = dbcon.connection;
                    cmd.Prepare();
                    cmd.ExecuteNonQuery();

                    dbcon.closeConnection();
                    return true;
                }
                else
                {
                    dbcon.closeConnection();
                    return false;
                }

            }
            catch (MySqlException e)
            {
                int errorcode = e.Number;
                dbcon.closeConnection();
                return false;
            }
        }
        public static bool updateMembership(Membership m)
        {
            //try
            //{

            DBConnector dbcon = new DBConnector();

            if (dbcon.openConnection())
            {

                MySqlCommand cmd = new MySqlCommand();
                cmd.CommandText = "UPDATE membership SET institute=N'" + m.institute + "', post_name=N'" + m.post_name + "', method=N'" + m.method + "', member_id=N'" + m.member_id + "', contribution=N'" + m.contribution + "', begin_date='" + m.getBegin_date().ToString("yyyy-MM-dd") + "', renewal_date='" + m.getRenewal_date().ToString("yyyy-MM-dd") + "', status=N'" + m.status + "', personal_payment=" + m.personal_payment + ", active_date_person='" + m.getActive_date_person().ToString("yyyy-MM-dd") + "', institutional_payment=" + m.institutional_payment + ", active_date_insti='" + m.getActive_date_insti().ToString("yyyy-MM-dd") + "' WHERE employee_idemployee=" + Employee.employee_id + " AND idmembership=" + m.mem_id;
                cmd.Connection = dbcon.connection;
                cmd.Prepare();
                cmd.ExecuteNonQuery();

                dbcon.closeConnection();

                return true;
            }
            else
            {

                return false;
            }

            //}
            //catch (MySqlException e)
            //{
            //int errorcode = e.Number;
            //return false;
            //}
        }