C# Yılan Oyunu Acil Yardım...

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 WindowsFormsApplication4 
  { 
      public partial class Form1 : Form 
      { 
          public Form1() 
          { 
              InitializeComponent(); 
          } 
   
   
          Button[] yilan=new Button[10]; 
   
           
   
          private void Form1_KeyDown(object sender, KeyEventArgs e) 
          { 
              if (e.KeyCode == Keys.Up) 
              {                 
                  yilan[0].Location = new Point(yilan[0].Location.X, yilan[0].Location.Y - 20); 
                  for (int i = 0; i < 3; i++) 
                  {     
                      if (yilan[i] != null) 
                      { 
                          yilan[i + 1].Location = new Point(yilan[i].Location.X, yilan[i].Location.Y-20); 
                      } 
                  } 
              } 
              if (e.KeyCode == Keys.Right) 
              { 
              } 
              if (e.KeyCode == Keys.Down) 
              { 
              } 
              if (e.KeyCode == Keys.Left) 
              { 
              } 
          } 
   
          private void Form1_Load(object sender, EventArgs e) 
          { 
   
              Random rnd = new Random(); 
              int x = rnd.Next(50, Width -100); 
              int y = rnd.Next(50, Height - 100); 
              Button btn = new Button(); 
              btn.Name = "btn" + 0.ToString(); 
              btn.Location = new Point(x, y);             
              btn.Size = new Size(20,20); 
              btn.Text = string.Empty; 
              Controls.Add(btn); 
              yilan[0] = btn; 
              for (int i = 0; i < 3; i++) 
              { 
                  Button b = new Button(); 
                  b.Location = new Point(Controls[string.Format("btn{0}", i)].Location.X + 20, Controls[string.Format("btn{0}", i)].Location.Y); 
                  b.Name = "btn" + (i + 1).ToString(); 
                  b.Text = string.Empty; 
                  b.Size=new Size(20, 20); 
                  Controls.Add(b); 
                  yilan[i + 1] = b; 
              } 
          } 
   
                 
   
   
   
   
      } 
  }