private void CreateTestButton_Click(object sender, RoutedEventArgs e) { if (TestName.Text != "") { if (themeId != -1) { int num1; bool isNum = int.TryParse(TestTime.Text, out num1); if (TestTime.Text != "" && isNum != false) { int min = int.Parse(TestTime.Text); time = new DateTime(2020, 5, 24, 01, min, 00); DTOTest test = new DTOTest() { TestName = TestName.Text, TestTime = time, MixQuestionsOrder = mixQuestionOrder, MixAnswersOrder = mixAnswersOrder, ThemeId = themeId }; client.AddTest(test); main.Content = new AdminTests(client, mw, main); } else { MessageBox.Show("Please, enter correct test time!!!"); } } else { MessageBox.Show("Please select test theme!!!"); } } else { MessageBox.Show("Please enter name!!!"); } }