Object initializer

In the past we couldn't initialize an object without using a constructor. For example, we could create and initialize a Product object like this if the Product class had a constructor with three parameters:

Product p = new product(1, "first candy", 100.0);

Or we could create the object and then initialize it later, like this:

            Product p = new Product();
            p.ProductID = 1;
            p.ProductName = "first candy";
            p.UnitPrice=(decimal)100.0;

Now with the new object initializer feature we can do it as follows:

Product product = new Product
{
    ProductID = 1,
    ProductName = "first candy",
    UnitPrice = (decimal)100.0
};

At compile time the compiler will automatically insert the necessary property setter code. So again this new feature is a Visual Studio compiler feature. The compiled assembly is actually a valid .NET 2.0 assembly.

We can also define and initialize a variable with an array, like this:

var arr = new[] { 1, 10, 20, 30 };

This...