How do you create an asynchronous method in C#?

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Every blog post I’ve read tells you how to consume an asynchronous method in C#, but for some odd reason never explain how to build your own asynchronous methods to consume. So I have this code right now that consumes my method:

private async void button1_Click(object sender, EventArgs e)
{
    var now = await CountToAsync(1000);
    label1.Text = now.ToString();
}

And I wrote this method that is CountToAsync:

private Task<DateTime> CountToAsync(int num = 1000)
{
    return Task.Factory.StartNew(() =>
    {
        for (int i = 0; i < num; i++)
        {
            Console.WriteLine("#{0}", i);
        }
    }).ContinueWith(x => DateTime.Now);
}

Is this, the use of Task.Factory, the best way to write an asynchronous method, or should I write this another way?

3 Answers
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