1private bool WaitForSuccess(Func<bool> action, int millsecondTimeout = 2000)
2{
3    var start = DateTime.Now;
4    while ((DateTime.Now - start).TotalMilliseconds <= millsecondTimeout)
5    {
6        if (action()) return true;
7        Task.Delay(1); // or Thread.Sleep(1);

8    }
9    return false;
10}

if (close)
    if (!WaitForSuccess(() => _connection.State == ConnectionState.Closed))
        Trace.TraceWarning("The connection {0} close command timed-out!", _connection.ConnectionString);