Refactoring_to_improve_maintainability_and_blendability_using_IoC_part_2_01.cs

public class ApplicationHost
{
    private static volatile ApplicationHost instance;
    private static object syncRoot = new Object();

    private ApplicationHost()
    {
        Execute.InitializeWithDispatcher();

        // Initialize the Funq container.
        this.Container = new Container();
    }

    public static ApplicationHost Current
    {
        get
        {
            if (instance == null)
            {
                lock (syncRoot)
                {
                    if (instance == null)
                        instance = new ApplicationHost();
                }
            }
            return instance;
        }
    }

    public Container Container { get; private set; }
}