C# "The name 'pictureBox1' does not exist in the current context."

using System;
using System.Collections.General;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Drawing;

namespace WindowsFormsApplication1
{
    static class program
    {

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STATHREAD]
        static void Main()
        {

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(newForm1());

            US>//#string URL="http://www.example.jp/images/banana_i01.jpg";
            string path = Path.GetTempFileName();

            WebClient client=new WebClient();
            client.DownloadFile (URL, path);

            string oldPath=path;
            string newPath=Path.ChangeExtension(oldPath, ".jpg");

            File.Move(oldPath, newPath);

            Bitmap canvas = new Bitmap (pictureBox1.Width, pictureBox1.Height);

            Graphics g=Graphics.FromImage(canvas);

            Image img = Image.FromFile (newPath);
            g.DrawImage(img, 10, 20, img.Width, img.Height);
            img.Dispose();

            g.Dispose();

            pictureBox1.Image=canvas;


        }
    }
}