VS 2015 : ?. ve ?[ Operatörleri

int? length = customers?.Length; // customers null ise null değilse customers.Length

Customer first = customers?[0];  // customers null ise null değilse customers[0]

int? count = customers?[0]?.Orders?.Count();  // customers, customers[0], customers[0].Orders null ise null değilse customers[0].Orders.Count()