private void ButtonAdd_Click(object sender, RoutedEventArgs e)
        {
            CollegeSubjectDialog collegeSubjectDialog = new CollegeSubjectDialog()
            {
                Title = "Adicionar Curso"
            };

            if (collegeSubjectDialog.ShowDialog() == true)
            {
                subjects.Add(DbContextHelper.AddCollegeSubject(_db, collegeSubjectDialog.CollegeSubject));
                subjectGrd.SelectedIndex = subjectGrd.Items.Count - 1;
            }
        }
        private void ButtonEdit_Click(object sender, RoutedEventArgs e)
        {
            CollegeSubject employeeEdit = subjectGrd.SelectedItem as CollegeSubject;

            if (employeeEdit == null)
            {
                return;
            }
            CollegeSubjectDialog collegeSubjectDialog = new CollegeSubjectDialog(new CollegeSubject(employeeEdit))
            {
                Title = "Editar Curso"
            };

            if (collegeSubjectDialog.ShowDialog() == true)
            {
                DbContextHelper.EditSubject(_db, collegeSubjectDialog.CollegeSubject);
                subjectGrd.Items.Refresh();
            }
        }