Initializer.cs

public class Initializer
{
    public static void Process(PipelineArgs args)
    {
        container = new Container();
        container.Options.DefaultScopedLifestyle = new WebRequestLifestyle();
        container.Register(typeof(ISitecoreContext), () => new SitecoreContext(), Lifestyle.Scoped);
        DependencyResolver.SetResolver(
          new ChainedDependencyResolver(
            new SimpleInjectorDependencyResolver(container),
            DependencyResolver.Current));
    }
}