singleton pattern

singleton.cs

//from https://csharpindepth.com/articles/singleton
public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();

    // Explicit static constructor to tell C# compiler
    // not to mark type as beforefieldinit
    static Singleton()
    {
    }

    private Singleton()
    {
    }

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