static void Main(string[] args)
{
// Null-conditional operator.
string name = null;
var nameLength = name?.Length;
List<string> names = null;
nameLength = names?[0].Length;
var notifier = new Notifier();
notifier.ChangeState();
notifier.StateChanged += (sender, e) => WriteLine("StateChanged notification received...");
notifier.ChangeState();
// await in catch/finally blocks.
notifier.ChangeStateAsync().Wait();
// Auto-property initializers + expression-bodied members + string interpolation.
var snapshot = new Snapshot();
WriteLine(snapshot);
WriteLine($"{snapshot.UserName} created on {snapshot.Timestamp} with name length of {name?.Length ?? 0}");
// nameof expressions.
WriteLine(nameof(args));
WriteLine(nameof(notifier));
WriteLine(nameof(Main));
WriteLine(nameof(Program));
ReadLine();
}