ExtractResource.cs

public static byte[] ExtractResource(string filename)
{
    var assembly = Assembly.GetExecutingAssembly();
    var name = assembly.GetManifestResourceNames().Single(s => s.EndsWith(filename));

    var stream = assembly.GetManifestResourceStream(name);

    var ms = new MemoryStream();
    stream.CopyTo(ms);

    return ms.ToArray();
}