static QuestionService()
{
service = new GenericCrudByIntegerKey <Question>(new QuestionData());
SubjectService = new GenericCrudByIntegerKey <Subject>(new SubjectData());
}
static StudentService()
{
service = new GenericCrudByIntegerKey <Student>(new StudentCrud());
}
static GradeServiceTwo()
{
service = new GenericCrudByIntegerKey <Grade>(new GradeCrud());
validateService = new ValidateGrid(new GradeCrud());
}