New Features in .Net 4.0

.Net 4 has introduced some exciting new features. Here are some of them listed below. I will take an overview of these (which i have used) features as c# developer

Dynamic Lookup (New to C#)

C# added a new static type named dynamic. Although there is a lot that goes into making this new type work, but using it is eady. You can think of the dynamic type as an object that supports late binding

dynamic Car = GetCar();               //Get a reference to the dynamic object
Car.Model = "Mondeo";                 //Assign a value to a property (also works for fields)
Car.StartEngine();                    //Calling a method
Car.Accelerate(100);                  //Call a methods with parameters
dynamic Person = Car["Driver"];       //Getting with an indexer
Car["Passenger"] = CreatePassenger(); //Setting with an indexer

Named and Optional Parameters (New to C#)

Named parameters were in VB only, and now are finally being incorporated into C#. As the name suggests, optional parameters are parameters that you can (have option) to pass into a method or constructor. If you opt not to pass a parameter, the method simply uses the default value defined for the parameter. To make a method parameter optional in C#, you just give it a default value

public void CreateBook(string title="No Title", int pageCount=0, string isbn = "0-00000-000-0")
{
  this.Title = title;
  this.PageCount = pageCount;
  this.ISBN = isbn;
}