troubleshooting Question

Singleton example 2

Avatar of AlHal2
AlHal2Flag for United Kingdom of Great Britain and Northern Ireland asked on
C#Microsoft Visual Studio
10 Comments1 Solution88 ViewsLast Modified:
How do I call an instance of this class using C# in Visual Studio 2017?  At the moment I have a console App.  In the static main method I have this code, but can't invoke the Inventory class due to its protection level.

static void Main(string[] args)
            Inventory I1 = new Inventory();

I've seen a similar question here, but I want to understand what's happening rather than just copy and paste
I'd like to see the class invoked successfully once then produce an error message when I try to invoke it a second time.

    private static readonly Lazy<Inventory> instance = new Lazy<Inventory>(() => new Inventory());
    private Inventory()
    { }
    public static Inventory Instance
        get { return instance.Value; }
    public void LookupProduct(string upc)

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