Message message = new Message(
"skeet@pobox.com",
"csharp-in-depth-readers@everywhere.com",
"I hope you like the second edition")
{
       Subject = "A quick message"  // <=  {Subject = "A quick message"   }; what is it?
};

Message message = new Message(
"skeet@pobox.com",
"csharp-in-depth-readers@everywhere.com",
"I hope you like the second edition")
{
       Subject = "A quick message"
};

Message tmp = new Message("skeet@pobox.com",
    "csharp-in-depth-readers@everywhere.com",
    "I hope you like the second edition");
tmp.Subject = "A quick message";
Message message = tmp;

// The argument names may be wrong here; I don't have the book with me.
// Intellisense will prompt you though :)
Message message = new Message(
    from: "skeet@pobox.com",
    to: "csharp-in-depth-readers@everywhere.com",
    body: "I hope you like the second edition",
    subject: "A quick message);

Message message = new Message(
    "skeet@pobox.com",
    "csharp-in-depth-readers@everywhere.com",
    "I hope you like the second edition")

{
           Subject = "A quick message"  // <=  {Subject = "A quick message"   }; what is it?
    };

Message m = new Message() {From="F", To="T", Subject="Whatever"}; // default ctor followed by property setters
Message m = new Message {From="F", To="T", Subject="Whatever"}; // allowed to omit paranthesis for default ctor
Message m = new Message(sFrom, sTo) {Subject="Whatever"}; // parameterized ctor followed by property setter

var newMessage = new {From="F", To="T", Subject="Whatever"};