public Subject Insert(Subject entity)
{
ValidatorTool.FluentValidate(new SubjectValidator(), entity);
var isExist = _subjectDal.Get(x => x.SubjectName == entity.SubjectName);
if (isExist != null)
{
throw new DataExistException("A Subject with the same name already exists.");
}
return(_subjectDal.Insert(entity));
}
