Tworzenie menu górnego - zmiana koloru tła formy



using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Menu5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void CzerwonyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.BackColor = Color.Red;
        }

        private void ZielonyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.BackColor = Color.Green;
        }

        private void NiebieskiToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.BackColor = Color.Blue;
        }

        private void RGBToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int r, g, b;
            int.TryParse(toolStripTextBox1.Text, out r);
            int.TryParse(toolStripTextBox2.Text, out g);
            int.TryParse(toolStripTextBox3.Text, out b);
            this.BackColor = Color.FromArgb(r, g, b);
        }
    }
}