求指教 关于贪吃蛇

没有任何美工
我用了100行代码完成
有没有好的算法
可以让代码短点  
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 贪吃蛇
{
    public partial class Form1 : Form
    {
        int k;
        char a = 's';
        Point[] b = new Point[100];
        int c = 0;
        Point ai = new Point();
        Point bi = new Point();
        Random ran = new Random();
        PictureBox a1= new PictureBox();
        public Form1()
        {
            KeyPreview = true;
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
        }        private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            string key=e.KeyChar.ToString();
            switch (key)
            {
                case "w": a = 'w'; break;
                case "a": a = 'a'; break;
                case "s": a = 's'; break;
                case "d": a = 'd'; break;
            }
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            loli();//蛇的行动
            switch (a)
            {
                case 'w': pictureBox1.Top -= 30; break;
                case 'a': pictureBox1.Left -= 30; break;
                case 's': pictureBox1.Top += 30; break;
                case 'd': pictureBox1.Left += 30; break;
            }
            for (k = 0; k < c; k++)//定位到蛇的行动
                foreach (PictureBox i in Controls)
                    if (i.Name == ("a"+(k + 1).ToString()))
                    {
                        i.Location = b[k];
                    }
            lili();//给蛇增加长度
            panduan();//判断胜负        }
        void loli()
        {
            for (k = c - 1; k >0; k--)
            {
                b[k] = b[k - 1];
            }
            b[0] = pictureBox1.Location;
        }
        void lili()
        {
            if (pictureBox1.Location == pictureBox2.Location)
            {
                c++;
                PictureBox a1 = new PictureBox();
                ai=a1.Location = pictureBox1.Location;
                a1.Size = pictureBox1.Size;
                a1.BackColor = Color.Red;
                a1.Name = "a" + c.ToString();
                Controls.Add(a1);
                pictureBox2.Location = new Point( ran.Next(10, 100)%10*30,ran.Next(10, 100)/10*30);
            }
        }
       void panduan()
       {
           for(k=0;k<c;k++)
           foreach (PictureBox i in Controls)
               if (i.Location==pictureBox1.Location&&ai!=i.Location&&i.Name!="pictureBox1")
               {
                   timer1.Enabled = false;
                   MessageBox.Show("游戏失败");
                   Close();
               }
           bi = pictureBox1.Location;
           if (bi.X < 0 || bi.X > 320 || bi.Y < 0 || bi.Y > 290)
           {
               timer1.Enabled = false;
               MessageBox.Show("游戏失败");
               Close();
           }        
       }
    }
}