private void StartQuizpictureBox_Click(object sender, EventArgs e)
        {
            StartQuizForm sqf = new StartQuizForm();

            this.Hide();
            sqf.Show();
        }
        private void label13_Click(object sender, EventArgs e)
        {
            StartQuizForm sqf = new StartQuizForm();

            this.Hide();
            sqf.Show();
        }