public MainWindow()
        {
            InitializeComponent();
            ViewModel   = new MainViewModel(this);
            DataContext = ViewModel;


            //using (var Context = new SchoolObjContext())
            //{
            //    Student Student = (from s in Context.Students
            //                       where s.FirstName.StartsWith("Vaitul") || s.MiddleName.StartsWith("Vaitul") || s.LastName.StartsWith("Vaitul")
            //                       select s).FirstOrDefault();
            //    if (Student != null)
            //    {

            //        dynamic obj = (from Subjects in Context.Subjects

            //                       join Marksheet in Context.AllMarks
            //                       on Subjects.Id equals Marksheet.SubjectId

            //                       where Marksheet.StudentId == Student.StudentId && Marksheet.StandardId == Student.StandardId
            //                       select new
            //                       {
            //                           Subject = Subjects.Name,
            //                           Mark = Marksheet.Mark,
            //                           SubjectResult = Marksheet.Mark >= 35 ? true : false
            //                       }).ToList();
            //    }
            //}
        }