When we should use Lazy<T> objects?

Hello Anand,

You typically use it when you want to instantiate something the first time its actually used. This delays the cost of creating it till if/when it's needed instead of always incurring the cost. Usually this is preferable when the object may or may not be used and the cost of constructing it is non-trivial.

For example Lazy makes implementing lazy, thread-safe singletons easy.

public sealed class Singleton
{
private static readonly Lazy lazy =
new Lazy(() => new Singleton());
public static Singleton Instance { get { return lazy.Value; } }
private Singleton()
{
}
}