async Task is freezing the UI

Question

I have a method like this:

private async Task DoSomething()
{
    // long running work here.
}

When I call the method like this it blocks t

Answer 1

How are you using await? This doesn't block the UI:

    private async Task DoSomething()
    {
        await Task.Delay(5000);
    }

    private async void button1_Click(object sender, EventArgs e)
    {
        await DoSomething();
        MessageBox.Show("Finished");
    }

Note that I didn't have to write any verbose callback stuff. That's the point of async/await.