private void button1_Click(object sender, EventArgs e) { try { OpenFileDialog opendialog = new OpenFileDialog(); opendialog.Filter = "FCT Exam File Template (*.XML)|*.XML"; opendialog.DefaultExt = "XML"; opendialog.AddExtension = true; if (opendialog.ShowDialog() == DialogResult.OK) { anExam = SerializationHelper.DeserializeXML <Exam>(File.ReadAllText(opendialog.FileName)); foreach (var q in anExam.QuestionsList) { QuizHelper.AddQuestionTortb(ref rtb, q.QuestionNumber, q, true, true); } anExam.EncryptAnswerandExplanation(instructorPassTxtBox.Text); } } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }