Async Method in C#, using async and await

AsyncAwaitImpl.cs

using System;
using System.IO;
using System.Threading.Tasks;

class AsyncAwaitImpl
{
    static void Main()
    {
	// Create task and start it.
	// ... Wait for it to complete.
	Task task = new Task(ProcessDataAsync);
	task.Start();
	task.Wait();
	Console.ReadLine();
    }

    static async void ProcessDataAsync()
    {
	// Start the HandleFile method.
	Task<int> task = HandleFileAsync("C:\\enable1.txt");

	// Control returns here before HandleFileAsync returns.
	// ... Prompt the user.
	Console.WriteLine("Please wait patiently " +
	    "while I do something important.");

	// Wait for the HandleFile task to complete.
	// ... Display its results.
	int x = await task;
	Console.WriteLine("Count: " + x);
    }

    static async Task<int> HandleFileAsync(string file)
    {
	Console.WriteLine("HandleFile enter");
	int count = 0;

	// Read in the specified file.
	// ... Use async StreamReader method.
	using (StreamReader reader = new StreamReader(file))
	{
	    string v = await reader.ReadToEndAsync();

	    // ... Process the file data somehow.
	    count += v.Length;

	    // ... A slow-running computation.
	    //     Dummy code.
	    for (int i = 0; i < 10000; i++)
	    {
		int x = v.GetHashCode();
		if (x == 0)
		{
		    count--;
		}
	    }
	}
	Console.WriteLine("HandleFile exit");
	return count;
    }
}