What is this C# syntax called?

WeirdSyntax.cs

namespace Trine.CLI
{
    class Program
    {
        static void Main()
        {
            new Crash
            {
                Inner = {Name = "what"}
            };
        }
    }


    public class InnerType {
        public string Name { get; set; }
    }

    public class Crash
    {
        public Crash() {
            Inner = new InnerType();
        }
        public InnerType Inner { get; set; }
    }

}