private void Button_Click_1(object sender, RoutedEventArgs e) { try { Course course = new Course(); course.Name = txtCName.Text.ToString(); CourseBL courseBL = new CourseBL(); User user = new User(); grid.ItemsSource = courseBL.GetCourseByName(course.Name); } catch (Exception ex) { MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error); } }