c#, free hand risanje

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
// 1. 
using System.Data;
using System.Drawing.Drawing2D;

namespace Risanje_z_MISKO_freehand_risanje
{
    public partial class Form1 : Form
    {
        // 2.
        private Point[] thePoints;
        private int counter;
        
        public Form1()
        {
            InitializeComponent();
            // 3.
            thePoints = new Point[1000]; 
            for (int i = 0; i < thePoints.Length; i++)
                thePoints[i] = new Point(0, 0);
            counter = 0;
        }
        // 4.
        protected override void OnPaint(PaintEventArgs e)
        {
            if (counter == 0)
                return;

            Pen greenPen = new Pen(Color.Red, 4);
            Point[] curvePoints = new Point[counter];

            for (int i = 0; i < curvePoints.Length; i++)
            {
                curvePoints[i] = new Point(0, 0);
                curvePoints[i].X = thePoints[i].X;
                curvePoints[i].Y = thePoints[i].Y;
            }
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            e.Graphics.DrawCurve(greenPen, curvePoints);
        }
        //5.
        protected override void OnLoad(System.EventArgs e)
        {
            MouseMove += new MouseEventHandler(Form1_MouseMove);
            MouseUp += new MouseEventHandler(Form1_MouseUp);
        }
        //6.1.
        private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                thePoints[counter].X = e.X;
                thePoints[counter].Y = e.Y;
                Label l = new Label();
                this.SuspendLayout();

                counter++;
                if (counter > 4)
                    this.Refresh();
            }
        }
        //6.2.
        private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                thePoints[counter].X = e.X;
                thePoints[counter].Y = e.Y;
                //Label l = new Label();
                //this.SuspendLayout();

                // ta povezuje krivulje med sabo
                //counter++;
                //if (counter > 4)
                    //this.Refresh();

                // s tem pa rišeš ponovno vsako zase a prejšnjo ?a?ko izbriše!:
                counter = 0;
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
        }
    }
}