MyWinforms

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 WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        int r = 0;
        int g = 0;
        int b = 0;
        enum MyColors { Black, Red, Yelloy, Green, Blue, Pink, White }
        MyColors myColor = MyColors.Black;

        public Form1()
        {
            InitializeComponent();
            Timer tim = new Timer();
            tim.Interval = 50;
            tim.Tick += Tim_Tick;
            tim.Start();


        }

        public void chengBackColor()
        {
            if (myColor == MyColors.Black)
            {
                if (r < 255)
                {
                    r++;
                    this.BackColor = Color.FromArgb(r, g, b);
                }
                else
                {
                    myColor = MyColors.Red;
                }
            }
            if (myColor == MyColors.Red)
            {
                if (g < 255)
                {
                    g++;
                    this.BackColor = Color.FromArgb(r, g, b);
                }
                else
                {
                    myColor = MyColors.Yelloy;
                }

            }
            if (myColor == MyColors.Yelloy)
            {
                if (r > 0)
                {
                    r--;
                    this.BackColor = Color.FromArgb(r, g, b);
                }
                else
                {
                    myColor = MyColors.Green;
                }

                if (myColor == MyColors.Green)
                {
                    if (g > 0 && b < 255)
                    {
                        g--;
                        b++;
                        this.BackColor = Color.FromArgb(r, g, b);
                    }
                    else
                    {
                        myColor = MyColors.Blue;
                    }
                }
                if (myColor==MyColors.Blue)
                {
                    if
                }
            }





            // this.BackColor = Color.FromArgb(r, g, b);
            // if (r < 255)

            // {
            //     r++;
            // }
            // else if (g<255)
            // {
            //     g++;
            // }
            ////else if (b < 255)
            //// {
            ////     b++;
            //// }

        }

        private void Tim_Tick(object sender, EventArgs e)
        {

            chengBackColor();
        }
    }
}