From: http://hjerpbakk.com/blog/2013/10/1/async-method-caller-easy-async-without-await.html View the complete code in: https://github.com/Sankra/CSharpExamples

ViewModelWithBackgroundWorker.cs

public class ViewModelWithBackgroundWorker {
    private readonly BackgroundWorker worker;

    public ViewModelWithBackgroundWorker() {
        worker = new BackgroundWorker();
        worker.DoWork += DoSomething;
        worker.RunWorkerCompleted += WorkCompleted;
    }

    public string Message { get; set; }
    public string Result { get; set; }

    public void ExecuteAsync() {
        Message = "Loading...";
        worker.RunWorkerAsync();
    }

    private void DoSomething(object sender, DoWorkEventArgs e) {
        e.Result = "Result";
    }

    private void WorkCompleted(object sender, RunWorkerCompletedEventArgs e) {
        if (e.Error != null) {
            HandleError(e.Error);
        } else {
            Message = "Completed";
            Result = (string)e.Result;
        }
    }

    private void HandleError(Exception exception) {
        Message = exception.Message;
    }
}