private void add_click(object sender, RoutedEventArgs e) //adds the assignments to the list and the listview
        {
            Builder build = new Info_Builder();

            if (Assigntitle.Text == "" || Classbox.Text == "")
            {
                MessageBox.Show("Assignment title and course selection needed.");
                return;
            }

            if (monthbox.Text == "" || daybox.Text == "" || yearbox.Text == "")
            {
                monthbox.Text = "-";
                daybox.Text   = "-";
                yearbox.Text  = "-";
            }

            string date = monthbox.Text + "/" + daybox.Text + "/" + yearbox.Text;

            Assignment homework = build.Assignment_build(Assigntitle.Text, Classbox.Text, date, notes.Text);

            Classbox.Text    = "";
            Assigntitle.Text = "";
            daybox.Text      = "";
            monthbox.Text    = "";
            yearbox.Text     = "";
            notes.Text       = "";

            viewAssignmentList.Items.Add(homework);
            MyAssignments.Add(homework);
            addassign.Content = "Add Assignment";
        }
        private void open_assignments_file() //opens the file of assignments
        {
            using (var file = new System.IO.StreamReader(@"saves\StudentAssignments.txt"))
            {
                string line;

                while ((line = file.ReadLine()) != null)
                {
                    Assignment homework = new Assignment();

                    homework.AssignName = line;
                    line               = file.ReadLine();
                    homework.Notes     = line;
                    line               = file.ReadLine();
                    homework.ClassName = line;
                    line               = file.ReadLine();
                    homework.DueDate   = line;

                    if (MyClasses.Contains(homework.ClassName))
                    {
                        MyAssignments.Add(homework);
                        viewAssignmentList.Items.Add(homework);
                    }
                }
            }
        }
        private void incomplete_Click(object sender, RoutedEventArgs e) //uer clicks to mark assignment as incomplete
        {
            if (viewCompletedAssignments.SelectedItems.Count == 0)
            {
                MessageBox.Show("No assignment selected.");
                return;
            }

            Assignment homework = (Assignment)viewCompletedAssignments.SelectedItems[0];

            MyAssignments.Add(homework);
            viewAssignmentList.Items.Add(homework);
            viewCompletedAssignments.Items.Remove(homework);
            Completed.Remove(homework);
            save_completed();
            save_to_file();
        }