When should I use Lazy<T>?

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I found this article about Lazy: Laziness in C# 4.0 – Lazy

What is the best practice to have best performance using Lazy objects? Can someone point me to a practical use in a real application? In other words, when should I use it?

lazy-evaluation .net c#
7 Answers

You should look this example to understand Lazy Loading architecture

private readonly Lazy<List<int>> list = new Lazy<List<int>>(() =>
{
    List<int> configList = new List<int>(Thread.CurrentThread.ManagedThreadId);
    return configList;
});
public void Execute()
{
    list.Value.Add(0);
    if (list.IsValueCreated)
    {
        list.Value.Add(1);
        list.Value.Add(2);

        foreach (var item in list.Value)
        {
            Console.WriteLine(item);
        }
    }
    else
    {
        Console.WriteLine("Value not created");
    }
}

--> output --> 0 1 2

but if this code dont write "list.Value.Add(0);"

output --> Value not created

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