Question

Why does the paint even take so long?

public Form1()
    {
        InitializeComponent();
        SuspendLayout();
        double scale = ClientSize.Width / 11;
        for (int i = 1; i < 10; i++)
        {
            for (int j = 1; j < 10; j++)
            {
                everybox[i - 1, j - 1] = new TextBox
                                             {
                                                 Location = new Point((int)(scale * i), (int)(scale * j)),
                                                 Size = new Size((int)scale - 2, (int)scale - 2),
                                                 Multiline = true
                                             };
                Controls.Add(everybox[i - 1, j - 1]);
            }
        }
        ResumeLayout();
    }


private void Form1_Paint(object sender, PaintEventArgs e)
    {
        float scale = ClientSize.Width / 11;
        Graphics g = this.CreateGraphics();
        int counter = 0;
        for (float i = scale; i <= this.ClientSize.Width - scale; i += scale)
        {
            counter++;
            if ((counter - 1) % 3 != 0)
            {
                g.DrawLine(new Pen(Color.Black), new Point((int)i, (int)scale),
                           new Point((int)i, ClientSize.Width - (int)scale));
                g.DrawLine(new Pen(Color.Black), new Point((int)scale, (int)i),
                           new Point(ClientSize.Width - (int)scale, (int)i));
            }
            else
            {
                g.DrawLine(new Pen(Color.Black, 3f), new Point((int)i, (int)scale),
                           new Point((int)i, ClientSize.Width - (int)scale));
                g.DrawLine(new Pen(Color.Black, 3f), new Point((int)scale, (int)i),
                           new Point(ClientSize.Width - (int)scale, (int)i));
            }
        }
    }

It is rather annoying, and causes noticeable lag. everybox is a TextBox[9,9] object.

Answer 1

Per my comment, change:

Graphics g = this.CreateGraphics();

to

e.Graphics