How to switch Oval Shape backcolor after clicking on it?

Question

So thats my code, it works with a button but it doesnt work with my OvalShape. I need it for a Master Mind game in C#. The Oval shape should Change the Color after clicking on it. Its supposed to be able to Change into 6 Colors Red,Yellow,Blue,White,Green and Purple.

     private void ovalShape1_4_Click(object sender, EventArgs e)
    {
        Control ctrl = ((Control)sender);
        switch (ctrl.BackColor.Name)
        {
            case "Red":
                ctrl.BackColor = Color.Yellow;
                break;
            case "Black":
                ctrl.BackColor = Color.Green;
                break;
            case "White":
                ctrl.BackColor = Color.Red;
                break;
            case "Yellow":
                ctrl.BackColor = Color.Purple;
                break;
            default:
                ctrl.BackColor = Color.Red;
                break;





using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.VisualBasic.PowerPacks;

namespace Mastermind2
{
    public static class ControlCollectionExtension
    {
        public static IList<OvalShape> ToList(this ShapeCollection aiShapeCollection)
        {
            IList<OvalShape> aoShapes = new List<OvalShape>();

            foreach (OvalShape ctrl in aiShapeCollection)
                aoShapes.Add(ctrl);

            return aoShapes;
        }
    }
}

Answer 1

make public variable

int index = 0;

after that make this logic, may this help you

 private void ovalShape1_4_Click(object sender, EventArgs e)
{
OvalShape ctrl = ((OvalShape)sender);
        switch (index)
        {
            case 0:
                ctrl.BackColor = Color.Yellow;
                break;
            case 1:
                ctrl.BackColor = Color.Green;
                break;
            case 2:
                ctrl.BackColor = Color.Red;
                break;
            case 3:
                ctrl.BackColor = Color.Purple;
                break;
            default:
                ctrl.BackColor = Color.Red;
                index = 0;
                break;
        }
}

Answer 2

My guess is that you have no Click event handler assigned to the OvalShape controls.

   foreach (OvalShape ctrl in aiShapeCollection)
      ctrl.Click += ovalShape1_4_Click;
      aoShapes.Add(ctrl);