DeferMessage.cs

private static async Task<bool> DeferMessage(BrokeredMessage message)
{
    await message.DeferAsync().ConfigureAwait(false);

    var client = TopicClient.CreateFromConnectionString(ConnectionString, TopicName);
    var obj = new DeferredMessageModel { SequenceNumber = message.SequenceNumber };

    using (var ms = new MemoryStream())
    using (var writer = new StreamWriter(ms))
    using (var jsonWriter = new JsonTextWriter(writer))
    {                      
        var ser = new JsonSerializer();
        ser.Serialize(jsonWriter, obj);
        jsonWriter.Flush();

        ms.Position = 0;

        await client.SendAsync(new BrokeredMessage(ms)
        {
            Properties = { new KeyValuePair<string, object>("deferred", true) },
            ScheduledEnqueueTimeUtc = DateTime.UtcNow.AddMinutes(-5)
        }).ConfigureAwait(false);
    }

    return true;
}