/// <summary>
        /// מחיקת בוחן מרשימת הבוחנים
        /// </summary>
        /// <param name="mytester">הבוחן למחיקה</param>
        public void DeleteTester(Tester mytester)
        {
            try
            {
                IEnumerable <Test> deleteTest = GetAllTest(t => (t.TesterId == mytester.TesterId) && (t.DateTimeOfTest > DateTime.Now));
                if (deleteTest.Count() == 0)
                {
                    dal.DeleteTester(mytester);
                    throw new Exception("You have been deleted");
                }
                else
                {
                    mytester.isActive = false;

                    UpdateTester(mytester);
                    DateTime last = DateTime.Now;
                    foreach (Test item in deleteTest)
                    {
                        if (item.DateTimeOfTest > last)
                        {
                            last = item.DateTimeOfTest;
                        }
                    }
                    last.AddDays(1);
                    throw new Exception("We have update your status to not active - please try to remove yourself from the system in: " + last.ToString("dd/MM/yyyy"));
                }
            }
            catch (Exception e)
            { throw e; }
        }