public class Singleton private static readonly Lazy Singleton lazy new

public class Singleton
{
    private static readonly Lazy<Singleton> lazy = 
        new Lazy<Singleton>(() => new Singleton());
 
    public string Name { get; private set; }
         
    private Singleton()
    {
        Name = System.Guid.NewGuid().ToString();
    }
     
    public static Singleton GetInstance()
    {
        return lazy.Value;
    }
}