private void prevbutton_Click(object sender, EventArgs e)
 {
     state = state.prevState();
     // textBox1.Text = state.colour;
     textBox1.BackColor = state.GetColor();
 }
 private void nextbutton_Click(object sender, EventArgs e)
 {
     state = state.nextState();
     textBox1.BackColor = state.GetColor();
 }