// class that can draw a grid
    class Grid
    {
        public Grid()
        {
            // Set some defaults
            Origin = new Point(0, 0);
            GridCellSize = new Size(10, 10);
            HorizontalCells = 1;
            VerticalCells = 1;
        }

        public int HorizontalCells { get; set; }

        public int VerticalCells { get; set; }

        public Point Origin { get; set; }

        public Size GridCellSize { get; set; }

        public virtual void Draw(Graphics Graf, Pen pencil)
        {
            Point startP = new Point();
            Point endP = new Point();

            // Draw horizontals
            startP.X = Origin.X;
            endP.X = Origin.X + VerticalCells * GridCellSize.Width;
            for (int i = 0; i <= HorizontalCells; i++)
            {
                startP.Y = Origin.Y + i * GridCellSize.Height;
                endP.Y = startP.Y;
                Graf.DrawLine(pencil, startP, endP);
            }

            // Draw verticals
            startP.Y = Origin.Y;
            endP.Y = Origin.Y + HorizontalCells * GridCellSize.Height;
            for (int i = 0; i <= VerticalCells; i++)
            {
                startP.X = Origin.X + i * GridCellSize.Width;
                endP.X = startP.X;
                Graf.DrawLine(pencil, startP, endP);
            }
        }
    }

// code for the form
    public partial class Form1 : Form
    {
        Grid thisGrid = new Grid();

        public Form1()
        {
            InitializeComponent();
            // Init a grid
            thisGrid.Origin = new Point(5, 5);
            thisGrid.GridCellSize = new Size(40, 50);
            thisGrid.HorizontalCells = 5;
            thisGrid.VerticalCells = 7;
        }
       
        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            // Make some fancy pen, make ANY pen you like here
            Pen myPen = new Pen(Color.Blue, 2f);
            myPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
            myPen.DashCap = System.Drawing.Drawing2D.DashCap.Triangle;

            thisGrid.Draw(e.Graphics, myPen);
        }
    }