public bool search()
        {
            List <JobDTO> buffer = jobDAO.SelectPostsFor(model);

            if (model.EducationLevel.Equals("Professional"))
            {
                postings = buffer;
            }
            else
            {
                postings = new List <JobDTO>();

                foreach (JobDTO job in buffer)
                {
                    if (model.AverageMark >= job.RequiredGrade)
                    {
                        postings.Add(job);
                    }
                }
            }

            return(true);
        }