Singletons

As per the word of Jon Skeet: http://csharpindepth.com/Articles/General/Singleton.aspx

A Simple Solution

public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();

    static Singleton() { }

    private Singleton() { }

    public static Singleton Instance { get { return instance; } }
}

A Lazy Singleton

public sealed class Singleton
{
    private static readonly Lazy<Singleton> lazy = new Lazy<Singleton>(() => new Singleton());

    public static Singleton Instance { get { return lazy.Value; } }
    
    private Singleton() { }
}