static void Test()
{
  Action<string> action = delegate(string value)
  {
    Console.WriteLine(value);
  };
  action("Hello World");
}

class TestClass
{
  private void Print(string message)
  {
    Console.WriteLine(message);
  }
  public void Test()
  {
    string[] messages = new string[] { "Hello", "World" };
    int index = 0;
    Action<string> action = (m) =>
    {
      this.Print((index++) + ". " + m);
    };
    Array.ForEach(messages, action);
    Console.WriteLine("index = " + index);
  }
}

static void Process()
{
  List<Item> batchItems = new List<Item>();
  foreach (var item in ...)
  {
    batchItems.Add(item);
    if (batchItems.Count > 1000)
    {
      DataContext db = new DataContext();
      db.Items.InsertAllOnSubmit(batchItems);
      db.SubmitChanges();
      batchItems = new List<Item>();
    }
  }
}

static void Process()
{ 
  List<Item> batchItems = new List<Item>();
  foreach (var item in ...)
  {
    batchItems.Add(item);
    if (batchItems.Count > 1000)
    {
      ThreadPool.QueueUserWorkItem((o) =>
      {
        DataContext db = new DataContext();
        db.Items.InsertAllOnSubmit(batchItems);
        db.SubmitChanges();
      });
      batchItems = new List<Item>();
    }
  }
}

class TestClass
{
  ...
  private sealed class AutoGeneratedHelperClass
  {
    public TestClass m_testClassInstance;
    public int m_index;
    public void Action(string m)
    {
      this.m_index++;
      this.m_testClassInstance.Print(m);
    }
  }
  public void TestAfterCompiled()
  {
    AutoGeneratedHelperClass helper = new AutoGeneratedHelperClass();
    helper.m_testClassInstance = this;
    helper.m_index = 0;
    string[] messages = new string[] { "Hello", "World" };
    Action<string> action = new Action<string>(helper.Action);
    Array.ForEach(messages, action);
    Console.WriteLine(helper.m_index);
  }
}

private class AutoGeneratedClass
{
  public List<Item> m_batchItems;
  public void WaitCallback(object o)
  {
    DataContext db = new DataContext();
    db.Items.InsertAllOnSubmit(this.m_batchItems);
    db.SubmitChanges();
  }
}
static void Process()
{ 
  var helper = new AutoGeneratedClass();
  helper.m_batchItems = new List<Item>();
  foreach (var item in ...)
  {
    helper.m_batchItems.Add(item);
    if (helper.m_batchItems.Count > 1000)
    {
      ThreadPool.QueueUserWorkItem(helper.WaitCallback);
      helper.m_batchItems = new List<Item>();
    }
  }
}

private class WrapperClass
{
  private List<Item> m_items;
  public WrapperClass(List<Item> items)
  {
    this.m_items = items;
  }
  public void WaitCallback(object o)
  {
    DataContext db = new DataContext();
    db.Items.InsertAllOnSubmit(this.m_items);
    db.SubmitChanges();
  }
}
static void Process()
{
  List<Item> batchItems = new List<Item>();
  foreach (var item in ...)
  {
    batchItems.Add(item);
    if (batchItems.Count > 1000)
    {
      ThreadPool.QueueUserWorkItem(
        new WrapperClass(batchItems).WaitCallback);
      batchItems = new List<Item>();
    }
  }
}