How to connect .NET code to node red platform

I am having a .net code which is looking for a threshold value to send a message.I want this to light up an ledborg. I am using node-red platform and mosquitto-message broker to connect to the ledborg on a raspberry pi. But still confused on how to put the message from .net to nodered platform. Is there any message brokers we can use or something?? I am new to this area.

I'm not familiar with the node-red platform but if it communicates with mosquitto, you 'll probably be able to use this MQTT lib http://m2mqtt.codeplex.com/ to send messages to mosquitto.
Hope it helps.