public static string GetResourceFileContentAsString(string fileName)
    {
        var assembly = Assembly.GetExecutingAssembly();
        var resourceName = "Your.Namespace." + fileName;

        string resource = null;
        using (Stream stream = assembly.GetManifestResourceStream(resourceName))
        {
            using (StreamReader reader = new StreamReader(stream))
            {
                resource = reader.ReadToEnd();
            }
        }
        return resource;
    }