An obvious singleton implementation for .NET?

Question

I was thinking about the classic issue of lazy singleton initialization - the whole matter of the inefficiency of:

if (instance == null)
{
    instance = new         


        

Answer 1

This is the canonical, thread safe, lazy Singleton pattern in C#:

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();
    }
}