private void button2_Click(object sender, EventArgs e) { btnmat4 lv4 = new btnmat4(); lv4.Show(); this.Close(); }
private void btncaudung_Click(object sender, EventArgs e) { //MessageBox.Show("Chúc mừng bạn đã hoàn thành"); btnmat4 mat4 = new btnmat4(); mat4.Show(); this.Close(); }