private void AddTaskButton(object sender, RoutedEventArgs e) { if (NameOfTaskTB.Text == "" || TypeComboBox.Text == "" || DueDateOfTaskDP.SelectedDate == null || EndDateOfTaskDP.SelectedDate == null) { MessageBox.Show("Please enter all information"); } else { bool reocurring = false; string taskName = NameOfTaskTB.Text; string type = Convert.ToString(TypeComboBox.Text); DateTime dueDate = (DateTime)DueDateOfTaskDP.SelectedDate; DateTime endDate = (DateTime)EndDateOfTaskDP.SelectedDate; if (YesRB.IsChecked == true) { reocurring = true; } Task_ task = new Task_(taskName, type, reocurring, dueDate, endDate); student.AddTask(task); FileReadWrite file = new FileReadWrite(); file.AddTaskToFile(student, task); homeScreen home = new homeScreen(student); this.Close(); home.Show(); } }