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Entity Framework ObjectContext with Dependency Injection
public MyDBEntities ctx
{
    get
    {
        string ocKey = "ctx_" + HttpContext.Current.GetHashCode().ToString("x");
        if (!HttpContext.Current.Items.Contains(ocKey))
            HttpContext.Current.Items.Add(ocKey, new MyDBEntities ());
        return HttpContext.Current.Items[ocKey] as MyDBEntities ;
    }
}

public class IoCProvider
{
  private static IoCProvider _instance = new IoCProvider();

  private IWindsorContainer _container;

  public IWindsorContainer
  {
    get
    {
      return _container;
    }
  }

  public static IoCProvider GetInstance()
  {
    return _instance;
  }

  private IoCProvider()
  {
    _container = new WindsorContainer(new XmlInterpreter(new ConfigResource("castle")));
  }
}

<configuration>
  <configSections>
    <section name="castle" type="Castle.Windsor.Configuration.AppDomain.CastleSectionHandler, Castle.Windsor" />
  </configSections>

  <castle>
    <components>
      <component id="DalLayer"
                 service="MyDal.IDalLayer, MyDal"
                 type="MyDal.MyDalLayer, MyDal"
                 lifestyle="PerWebRequest">
        <!--
             Here we define that lifestyle of DalLayer is PerWebRequest so each
             time the container resolves IDalLayer interface in the same Web request
             processing, it returns same instance of DalLayer class
          -->
        <parameters>
          <connectionString>...</connectionString>
        </parameters>
      </component>
      <component id="BusinessLayer"
                 service="MyBll.IBusinessLayer, MyBll"
                 type="MyBll.BusinessLayer, MyBll" />
      <!--
           Just example where BusinessLayer receives IDalLayer as
           constructor's parameter.
        -->
    </components>
  </castle>

  <system.Web>
    ...
  </system.Web>
</configuration>

public IDalLayer
{
  IRepository<T> GetRepository<T>();  // Simplified solution with generic repository
  Commint(); // Unit of work
}

// DalLayer holds Object context. Bacause of PerWebRequest lifestyle you can
// resolve this class several time during request processing and you will still
// get same instance = single ObjectContext.
public class DalLayer : IDalLayer, IDisposable
{
  private ObjectContext _context; // use context when creating repositories

  public DalLayer(string connectionString) { ... }

  ...
}

public interface IBusinessLayer
{
  // Each service implementation will receive necessary
  // repositories from constructor.
  // BusinessLayer will pass them when creating service
  // instance

  // Some business service exposing methods for UI layer
  ISomeService SomeService { get; }
}

public class BusinessLayer : IBusinessLayer
{
  private IDalLayer _dalLayer;

  public BusinessLayer(IDalLayer dalLayer) { ... }

  ...
}

public abstract class MyBaseForm : Page
{
  private IBusinessLayer _businessLayer = null;
  protected IBusinessLayer BusinessLayer
  {
    get
    {
      if (_businessLayer == null)
      {
        _businessLayer = IoCProvider.GetInstance().Container.Resolve<IBusinessLayer>();
      }

      return _businessLayer;
  }

  ...
}