Singleton example from Jon Skeet

gistfile1.cs

public sealed class Singleton
{
    Singleton()
	{
	}

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

	class Nested
	{
		// Explicit static constructor to tell C# compiler
		// not to mark type as beforefieldinit
		static Nested()
		{
		}
		internal static readonly Singleton instance = new Singleton();
	}
}