Asynchronous programming with the async and await keywords

The async and await keywords were announced in C# 5.0 and became the latest and greatest things in C# asynchronous programming. Developed from the TAP pattern, C# integrates these two keywords into the language itself so that it makes it simple and easy to read. Using these two keywords, the Task and Task<TResult> classes still become the core building blocks of asynchronous programming. We will still build a new Task or Task<TResult> data type using the Task.Run() method, as discussed in the previous section.

Now let's take a look at the following code, which demonstrates the async and await keywords, which we can find in the AsyncAwait.csproj project:

public partial class Program 
{ 
  static bool IsFinish; 
  public static void AsyncAwaitReadFile() 
  { 
    IsFinish = false; 
    ReadFileAsync(); 
    //do other work while file is read 
    int i = 0; 
    do 
    {...