Fox.PictureBox.Image Fade Error

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 Fox536
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }

    public partial class Form1 : Form
    {
        string ImgPath = "C:\\test.png";
        public Form1()
        {
            this.Size = new Size(1000, 71);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
            PictureBox picBox = new PictureBox();
            this.Controls.Add(picBox);
            picBox.Image = Image.FromFile(ImgPath);
            picBox.Dock = DockStyle.Fill;
            picBox.SizeMode = PictureBoxSizeMode.StretchImage;
        }
    }
}