请高手帮我看看。

尝试修改成如下：
----------------------------

/*Dogrun.*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace Day_of_race
{
    public class Dogrun
    {
        public int StartPosition;
        public int RacetrackLength;
        public PictureBox MypictureBox;
        public int Location = 0;
        public Random Randomizer;

        public bool RUN()
        {
            Point startLocation = MypictureBox.Location;

            Random Randomizer = new Random();
            Location = Randomizer.Next(0, 10);              // 每次移动的像素大小
            RacetrackLength = 800;                          // 像素总大小

            for (int i = StartPosition; i <= RacetrackLength; i += Location)
            {
                MypictureBox.Location = new Point(MypictureBox.Location.X + i, MypictureBox.Location.Y/* + i*/);

            }
            if (MypictureBox.Location.X >= RacetrackLength)
            {
                MessageBox.Show(MypictureBox.Name + "end the race");
                MypictureBox.Location = startLocation;
            }
            return true;
        }

        /*
         * 添加构造函数，实例化所有对象
         */
        public Dogrun(PictureBox pb)
        {
            if (pb != null)
            {
                this.MypictureBox = pb;
            }
            else
            {
                throw new System.ArgumentNullException( "PictureBox");
            }
        }
    }
}
/*From*/
using System;
using System.Collections.Generic;
using using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Day_of_race;

namespace Day_of_race
{
    public partial class Form1 : Form
    {
        Dogrun Dog;
        public Form1()
        {
           
            InitializeComponent();
            Dog = new Dogrun( this.pictureBox2);
            Dog.StartPosition = pictureBox2.Location.X;
            Dog.RacetrackLength = pictureBox1.Location.Y;

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Dog.RUN();
        }

        private void pictureBox2_Click(object sender, EventArgs e)
        {
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }
    }
}

你报的是什么错?

我晕，你的代码是抄来的吧！
里面的参数都没设置，怎么调通？

    public class Dogrun
    {
        public int StartPosition;
        public int RacetrackLength;
        public PictureBox MypictureBox;
        public int Location = 0;
        public Random Randomizer;
        public bool RUN()
        {
            Random Randomizer=new Random();
            Location=Randomizer.Next(0,10);
            RacetrackLength = 75;

            for (int i = StartPosition; i <= 524; i += Location)
            {
                MypictureBox.Location = new Point(StartPosition + i, RacetrackLength);
                if (MypictureBox.Location.X >= 524)
                {
                    MessageBox.Show(MypictureBox.Name + "end the race");
                    return true;
                }
            }

            return true;
            }
        }

-------------------------
namespace Day_of_race
{
    public partial class Form1 : Form
    {
        Dogrun Dog;
        public Form1()
        {
            
            InitializeComponent();
            Dog = new Dogrun();
            Dog.StartPosition = pictureBox2.Location.X;
            Dog.RacetrackLength = pictureBox1.Location.Y;
            Dog.MypictureBox = pictureBox2;

        }
。。。。。