Question

What would be the best way to draw 25 rectangles (5*5) in c#?
I later need to be able to reach a specific rectangle and change its color, for instance change the color to red if the user inputs the incorrect word.
Would it be more suitable to create an array of rectangles in this case?

This is what i have so far

Graphics g = pictureBox1.CreateGraphics();

int x =0;
int y= 0;
int width = 20;
int height = 20;
for (int i = 0; i < 25; i++)
{
    if (i <= 4)
    {
        g.FillRectangle(Brushes.Blue, x, y, width, height);
        x += 50;
    }
    else if (i > 4)
    {
        y = 50;
        g.FillRectangle(Brushes.Blue, x, y, width, height);
        x += 50;
    }
}

Answer 1

This should get you started, not the complete code. You will need to add a PictureBox control and use the default name (picurebox1). EDIT: Need to add a button too 🙂

public partial class Form1 : Form
{
    public List<Rectangle> listRec = new List<Rectangle>();
    Graphics g;

    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Rectangle rect = new Rectangle();
        rect.Size = new Size(100,20);
        for (int x = 0; x < 5; x++)
        {
            rect.X = x * rect.Width;
            for (int y = 0; y < 5; y++)
            {
                rect.Y = y * rect.Height;
                listRec.Add(rect);
            }
        }

        foreach (Rectangle rec in listRec)
        {
            g = pictureBox1.CreateGraphics();
            Pen p = new Pen(Color.Blue);
            g.DrawRectangle(p, rec);
        }
    }

    public void ChangeColor(Rectangle target, Color targetColor)
    {
        Pen p = new Pen(targetColor);
        g.DrawRectangle(p, target.X, target.Y, target.Width, target.Height);
    }

    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        switch (e.KeyCode)
        {
            case Keys.D0: ChangeColor(listRec[0], Color.Red);
                break;
            case Keys.D1: ChangeColor(listRec[1], Color.Red);
                break;
            //..more code to handle all keys..
        }
    }    
}