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string[,] matrix = {
                { "1", "2", "3" },
                { "4", "5", "6" },
                { "7", "8", "9" }
            };					

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protected void OnPaint(PaintEventArgs e)
        {

            string[,] matrix = {
                { "1", "2", "3" },
                { "4", "5", "6" },
                { "7", "8", "9" }
            };

            for (int y = 0; y < matrix.GetLength(0); y++)
            {
                for (int x = 0; x < matrix.GetLength(1); x++)
                {
                    FontFamily font = new FontFamily("Arial");
                    Font points = new Font(font, 30, FontStyle.Regular, GraphicsUnit.Pixel);

                    rect.X += 25;
                    e.Graphics.DrawString(matrix[y, x].ToString(), points, new SolidBrush(Color.Black), rect);
                }

                rect.X = 10;
                rect.Y += 25;
            }
        }