private string GetExamId(string examinationType)
 {
     List<Examination> examinations = new List<Examination>();
     ExaminationGateway anExaminationGateway = new ExaminationGateway();
     examinations = anExaminationGateway.GetAllExaminations();
     foreach (Examination aExamination in examinations)
     {
         if (aExamination.ExaminationType == examinationType)
         {
             return aExamination.ExaminationId;
         }
     }
     return null;
 }
 public List<Examination> GetAllExaminations()
 {
     ExaminationGateway anExaminationGateway=new ExaminationGateway();
        return anExaminationGateway.GetAllExaminations();
 }