/// <summary>
 ///     Appends a new student to the studentlist if the student form is filled out correctly
 /// </summary>
 /// <param name="sender">The "Add Student" button</param>
 /// <param name="e"></param>
 private void SetStudent(object sender, RoutedEventArgs e)
 {
     try
     {
         listModel.SetStudent(studentModel.GetStudent());
     }
     catch (Exception ex)
     {
         studentModel.DisplayError(ex.Message);
     }
 }
        public MainWindow()
        {
            InitializeComponent();

            courseModel  = new CourseModel();
            studentModel = new StudentModel();
            listModel    = new ListModel(studentModel, courseModel);

            try
            {
                AssignInput();
                BindAll();
            } catch (Exception ex)
            {
                studentModel.DisplayError(ex.Message);
            }
        }