C#

var Moveing = Observable.FromEventPattern<MouseEventArgs>(this, "MouseMove").Select(evt => evt.EventArgs.GetPosition(this));
Moveing.Subscribe(evt => {
    this.Title = evt.ToString();
});

xNext = x*cos(alpha) - y*sin(alpha);
yNext = y*cos(alpha) + x*sin(alpha);

private FileWatcher_Changed(...)
{
    while(!IsFileAvailable())
    {
      // Do nothing until file is read-write<br />
    }

    // Do other stuff with the file
}

public bool IsFileAvailable(String sFilename)
{
    bool results = false;

    try
    {
        using (var inputStream = File.Open(sFilename, FileMode.Open, FileAccess.Read, FileShare.None))
        {
            results = inputStream.Length > 0;
        }
    }
    catch (Exception)
    {
        results = false;
    }

    return results;
}