public MainWindow()
        {
            InitializeComponent();
            rep = new Repository();
            List<Course> courses = new List<Course>();
            courses = rep.getCourses();
            comboStandardId.Items.SourceCollection = rep.getCourses();

        }
        public MainWindow()
        {
            InitializeComponent();
            rep = new Repository();
            List<Course> courses = new List<Course>();
            courses = rep.getCourses();
           

        }
        public MainWindow()
        {
            InitializeComponent();
            rep = new Repository();
            List<Course> courses = new List<Course>();
            courses = rep.getCourses();

            foreach (Course course in courses)
            {
                comboStandardId.Items.Add(course.CourseName);
            }

        }
        public MainWindow()
        {
            InitializeComponent();
            rep = new Repository();

            courses = rep.getCourses();

            standards = rep.getStandards();
            foreach (Standard standard in standards)
            {
                comboStandardId.Items.Add(standard.StandardName);
            }


        }
        public MainWindow()
        {
            InitializeComponent();
            rep = new Repository();
            newStudentCourses = new List<Course>();

            courses = rep.getCourses();
            foreach (Course course in courses)
            {
                comboCursos.Items.Add(course.CourseName);
            }

            standards = rep.getStandards();
            foreach (Standard standard in standards)
            {
                comboStandardId.Items.Add(standard.StandardName);
            }


        }