private void backButton_Click(object sender, EventArgs e)
 {
     this.answerTextBox.Clear();
     this.errorLabel.Text = "";
     this.loginTextBox.Clear();
     this.questionLabel.Text = "";
     this.Hide();
     startWindow.Show();
 }
 private void backButton_Click(object sender, EventArgs e)
 {
     this.Hide();
     startWindow.Show();
 }