private void pictureBox1_Click(object sender, EventArgs e)
        {
            First_form htu = new First_form();

            htu.Show();
            this.Hide();
        }
        private void pictureBox2_Click(object sender, EventArgs e)
        {
            First_form ft = new First_form();

            ft.Show();
            this.Hide();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            First_form Firstform = new First_form();

            Firstform.Show();
            this.Hide();
        }
        private void pictureBox3_Click(object sender, EventArgs e)
        {
            First_form ft = new First_form();

            ft.Show();
            this.Hide();
            _capture.Dispose();
            Application.Idle -= ProcessFrame;
        }