TimeBlock - using block for profiling

TimeBlock.cs

public class TimeBlock : IDisposable
{
    public TimeBlock(Action<int> handler = null, bool start = true)
    {
        _handler = handler;
        _watch = new Stopwatch();

        if (start)
            Start();
    }

    public void Start()
    {
        _watch.Start();
    }

    public void Stop()
    {
        _watch.Stop();

        if (_handler != null)
            _handler(Elapsed);
    }

    public void Dispose()
    {
        Stop();
    }

    public int Elapsed
    {
        get
        {
            return _watch.Elapsed.Milliseconds;
        }
    }

    public static TimeBlock Debug(string label)
    {
        return new TimeBlock(x => string.Concat(x, "ms ", label));
    }

    private readonly Action<int> _handler;

    private readonly Stopwatch _watch;
}

using(TimeBlock.Debug("a routine"))
{
..
}