Object initializers are handy when you need to create an object and set a couple of properties right away, but the available constructors are not sufficient. Say you have a class
public class Book
{
public string Title { get; set; }
public string Author { get; set; }
// the rest of class definition
}
To initialize a new instance of the class with an initializer:
Book theBook = new Book { Title = "Don Quixote", Author = "Miguel de Cervantes" };
This is equivalent to
Book theBook = new Book();
theBook.Title = "Don Quixote";
theBook.Author = "Miguel de Cervantes";