track bar value übernehmen

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Zeichen_Linien
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {


            
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            Graphics device = e.Graphics;
            int i;
            int x = 0;
            int y = 0;
            double l;
           l = Convert.ToDouble(trackBar1.Value);

           label1.Text = +l + "";

            for (i = 0; i < pictureBox1.Height*2; i=i+10)
            {
                device.DrawLine(Pens.Blue,pictureBox1.Width-i,y,pictureBox1.Width,y+i);
                device.DrawLine(Pens.Red,x+i,y,x,y+i);
               
                

            }
        }

        void trackBar1_Scroll(object sender, EventArgs e)
        {
            double l;
            l = (double)trackBar1.Value;
            label1.Text = +l + "";
          
            
        }
    }
}