How to write an asynchronous method?

Question

I have the following method:

public void Contar()
{
    int numero = 1;

    for (int i = 0; i < 100000; i++)
    {
        numero *= i
    }

    return numero
}

Supposing that the method Contar() take time to lock the UI of my application, as I do to make the asynchronous method?

Answer 1

You can use the class Task

public async Task AguardarContadorAsync()
{
     int retorno = await Task.Run(()=>Contar());
}

As you can notice you need to add Keyword async in the signature of the method.

More information:

What are Async Methods?

In C#, what is the await keyword for?