Modifier: async / await Used to mark a method as being asynchronous and to await results from the asynchronous processing. Available from .NET 4.5 (C# 5). Example: using System; using System.Net.Http; using System.Threading.Tasks; using System.Windows; namespace Examples {     /// <summary>     /// Interaction logic for MainWindow.xaml     /// </summary>     public partial class MainWindow…

Modifier: abstract Used to declare an incomplete implementation of a class, method, property, indexer or event. By declaring a class abstract, it can be used as a template when creating other classes. In the example below, the abstract class A forces any classes that are derived from it to include a ‘Test’ method. Failure to…

Operators: is Used to check whether a cast from type A to type B. It is often more efficient to do the cast using ‘as’ as it will return the casted content instead of just telling you that it would work if you tried. Example: If(lotus is Car) System.Console.WriteLine(“A Lotus is a Car”);  

Operators: as Used to cast without triggering an exception. More efficient than using the ‘is’ operator as the cast value is returned if the operation is successful while the ‘is’ operator only returns a bool to denote success or failure. Example:               Car c = lotus as Car;               If(c != null)                             System.Console.WriteLine(“Cast worked”);…