C#

using System;
using System.Threading.Tasks;
using System.Windows.Forms;

public static class MessageReceiver
{
    public static Task<string> WaitForMessage(Control window)
    {
        if (window == null) throw new ArgumentNullException("window");
        return new MessageListener(window).Status;
    }
    
    private sealed class MessageListener : NativeWindow
    {
        private const int WM_SUCCESS = 0x2000;
        private const int WM_FAILURE = 0x2001;
        
        private readonly TaskCompletionSource<string&gt; _status = new TaskCompletionSource<string&gt;();
        
        public MessageListener(Control parent)
        {
            _parent.HandleCreated += OnHandleCreated;
            _parent.HandleDestroyed += OnHandleDestroyed;
            
            if (_parent.IsHandleCreated)
            {
                OnHandleCreated(_parent, EventArgs.Empty);
            }
        }
        
        private void OnHandleCreated(object sender, EventArgs e)
        {
            AssignHandle(((IWin32Window)sender).Handle);
        }
        
        private void OnHandleDestroyed(object sender, EventArgs e)
        {
            ReleaseHandle();
        }
        
        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_SUCCESS:
                {
                    _status.TrySetResult("SUCCESS");
                    base.WndProc(ref m);
                    ReleaseHandle();
                    break;
                }
                case WM_FAILURE:
                {
                    _status.TrySetResult("FAILURE");
                    base.WndProc(ref m);
                    ReleaseHandle();
                    break;
                }
                default:
                {
                    base.WndProc(ref m);
                    break;
                }
            }
        }
        
        public Task<string> Status
        {
            get { return _status.Task; }
        }
    }
}

private async Task Foo()
{
    string status = await MessageReceiver.WaitForMessage(theForm);
    // Do something with the status here...
}

public enum CoinResult
    {
    Heads,
    Tails,
    }

CoinResult toss = FlipTheCoin(coin);
switch(toss)
   {
   default: throw new ArgumentException("Unknown CoinResult: " + toss);
   case CoinResult.Heads: 
      Console.WriteLine("It came down heads up.");
      break;
   case CoinResult.Tails: 
      Console.WriteLine("It came down with the tails showing.");
      break;
   }

int toss = FlipTheCoin(coin);
switch(toss)
   {
   default: throw new ArgumentException("Unknown coin flip state: " + toss);
   case 1: 
      Console.WriteLine("It came down heads up.");
      break;
   case 2: 
      Console.WriteLine("It came down with the tails showing.");
      break;
   }

^(Mon|Tues|Wednes|Thurs|Fri)day$

Member 11354386 wrote:

how can I modify the string to just Monday Tuesday etc?

^(Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday)$

Quote:

dwEventType [in]
If dwControl is SERVICE_CONTROL_POWEREVENT, this parameter can be one of the values specified in the wParam parameter of the WM_POWERBROADCAST message.