Change button color when clicked (multiple clicks/colors)

Question

I am trying to make a array of 8x8 buttons, and so far it works. Now I have stumbled upon a problem. I want the color of the button (backcolor) to change when it is clicked. And change to a different color when clicked again.

This is my code so far:

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        Button[,] btn = new Button[8,8];

        public Form1()
        {
            InitializeComponent();

            for (int x = 0; x < btn.GetLength(0); x++)
            {
                for (int y = 0; y < btn.GetLength(1); y++)
                {
                    btn[x,y] = new Button();
                    btn[x,y].SetBounds(40 * x, 40 * y, 40, 40);
                    btn[x,y].Click += new EventHandler(this.btnEvent_click);
                    Controls.Add(btn[x, y]);
                    btn[x,y].BackColor = Color.Black;
                }
            }

            /* 
            btn.Click += new EventHandler(this.btnEvent_click);
            btn[x,y].Text = Convert.ToString(x+","+y);
            Controls.Add(btn);
            btn[x,y].Click += new EventHandler(this.btnEvent_click);
            */
        }

        private void form1_load(object sender, EventArgs e)
        {

        }

        void btnEvent_click(object sender, EventArgs e)
        {
           (Control)sender).BackColor = Color.Red;
        }
    }
}

So far I can only change the color to red, and I've tried multiple if and for statements to change the color a second time.

Could anyone help me out?

Answer 1

Hi Temporary you can use below solution:

void btnEvent_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.White;
            break;
        case "White":
            ctrl.BackColor = Color.Red;
            break;
        case "Yellow":
            ctrl.BackColor = Color.Purple;
            break;
        default:
            ctrl.BackColor = Color.Red;
            break;
    }
}

I know there can be a better solution also, but meanwhile you can go with this...you can add more colors also in switch statment as required

Answer 2

You can make a new class, tha inherit from Button and handle internally the color change, something like this:

class TwoColorButton : Button
{
    private int stateCounter = 0;
    private Color[] states = new Color[] { Color.Black, Color.Red };

    public TwoColorButton()
        : base()
    {
        this.BackColor = states[stateCounter];
        this.Click += this.clickHandler;
    }

    protected void clickHandler(object sender, EventArgs e)
    {
        stateCounter = stateCounter == 0 ? 1 : 0;
        this.BackColor = states[stateCounter];
    }
}