public void GetDataTest()
        {
            TraineeBLO     TraineeBLO     = new TraineeBLO();
            TaskTraineeBLO TaskTraineeBLO = new TaskTraineeBLO(TraineeBLO.GetData().First().FileName);

            TaskTraineeBLO.GetData();
        }
        private void traineeBindingSource_PositionChanged(object sender, EventArgs e)
        {
            TaskTraineeBindingSource.Clear();

            Trainee trainee = (Trainee)traineeBindingSource.Current;

            if (trainee != null)
            {
                traineeTaskBLO = new TaskTraineeBLO(trainee.FileName);

                TaskTraineeBindingSource.DataSource = traineeTaskBLO.GetData();
                showTaskTainneeError();
            }
        }