C#

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[DllImport("advapi32.dll", CharSet=CharSet.Unicode, EntryPoint="RegOpenKeyEx")]
static extern long RegOpenKeyEx(
       IntPtr hKey,
       String subKey,
       uint options,
       int sam,
       out IntPtr phkResult);

<br />
private void AddRegNode(TreeNode node, RegistryKey root)<br />
{<br />
RegistryKey rk = root; <br />
String [] subkey = rk.GetSubKeyNames();<br />
if(subkey.Length==0) return;     //if I've no subkeys so I've got only leap<br />
foreach (String s in subkey)<br />
{<br />
String livia = rk.Name + "\\" + s;<br />
RegistryKey temp = Registry.CurrentUser.CreateSubKey(livia);<br />
TreeNode newNode = new TreeNode(s);<br />
this.Tree.SelectedNode.Nodes.Add(newNode);<br />
AddRegNode(newNode, temp);<br />

private void FillNode(TreeView treeView, TreeNode parentNode, RegistryKey key)
{
    int index = key.Name.LastIndexOf("\\");
    string keyname = key.Name;
    if (index > 0)
    {
        keyname = key.Name.Remove(0, index + 1);
    }

    TreeNode node = null;

    if (null == parentNode)
    {
        node = treeView.Nodes.Add(keyname);
    }
    else
    {
        node = parentNode.Nodes.Add(keyname);
    }
    string[] subkeyNames = key.GetSubKeyNames();
    RegistryKey subkey = null;
    foreach (string subkeyName in subkeyNames)
    {
        try
        {
            subkey = key.OpenSubKey(subkeyName);
        }
        catch (SecurityException e)
        {
            // Ignore keys that we don't have security to read them
            continue;
        }

        FillNode(treeView, node, subkey);
        subkey.Close();
    }
}

FillNode(treeView1, null, Microsoft.Win32.Registry.CurrentUser);

CurrencyManager cm = (CurrencyManager)dataGrid1.BindingContext[
  dataGrid1.DataSource, dataGrid1.DataMember];
if (cm != null)
{
  // You could also just cast 'Current' to a DataRowView.
  DataView view = cm.List as DataView;
  if (view != null)
  {
    DataRowView rowView = view[rowIndex];
    object value = rowView[0];
    if (value != null) return value.ToString();
    else return null;
  }
}

public class Game
{
   public void Draw()
   {
       // tens of lines of  code to draw team 1 
       // tens of lines of  code to draw team 2 
       // tens of lines of  code to draw goals 1 & 2
       // tens of lines of  code to draw ball
   }
}

public class Game
{
   private Ball ball;
   private Team team1;
   private Team team2;
   private Gaol goal1;
   private Gaol goal2;

   public void Draw()
   {
       ball.Draw();
       team1.Draw();
       team2.Draw();
       goal1.Draw();
       gaol2.Draw();
   }
}