WPF

public partial class MainWindow : Window
{
    Process Process { get; set; }
        
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        StartB();
        GetB();
    }

    void StartB()
    {
        var path = @"C:\Some\Path\To\B.exe";
        var info = new ProcessStartInfo(path);
        Process = new Process();
        Process.StartInfo = info;
        Process.Start();
    }

    void GetB()
    {
        var title = Process.MainWindowTitle;
        var visual = System.Windows.Interop.HwndSource.FromHwnd(Process.MainWindowHandle);
        var window = visual.RootVisual as Window;
    }
}

var visual = System.Windows.Interop.HwndSource.FromHwnd(Process.MainWindowHandle);

static void Main(string[] args)
{
    // Assigning properties and their values at runtime
    var x = new ExpandoObject() as IDictionary;
    x.Add("NewProp", "Hello World!");

    IDictionary propertyValues = x;
    foreach (var property in propertyValues.Keys)
    {
        Console.WriteLine(String.Format("{0} : {1}", property, propertyValues[property]));
    }

    // Creating properties in code and assigning data at runtime
    dynamic expando = new ExpandoObject();
    expando.SomeStringProp = "C";
    expando.SomeNumberProp = 12;

    expando.MyMethod = new Func(() =>
    {
        return 55;
    });

    Console.WriteLine(expando.SomeStringProp);
    Console.WriteLine(expando.SomeNumberProp);
    Console.WriteLine(expando.MyMethod());
    Console.ReadLine();
}

public void Start()
{
    try
    {
        var list = this.Where(x=>x.Status == WorkerStatus.NotStarted);
        Parallel.ForEach(list, this.options, worker=>
        {
            worker.DoWork(options.CancellationToken);
            // notice I'm not awaiting anything, so this call returns
            // immediately to the UI method that called it.
        });
    }
    catch (OperationCanceledException ex)
    {
        if (ex != null) { }
    }
}

private void DispatcherNotify(params string[] propertyNames)
{
    Dispatcher.CurrentDispatcher.Invoke(()=>
    {
        foreach(string name in propertyNames)
        {
            this.NotifyPropertyChanged(name); 
            Debug.WriteLine("{0} - {1}", this.IDName, name);
        }
    });
}