Share 'How can I use Grasshoper externally ?'

I am just a beginner and GH seems like a really cool tool. I want to use GH from with my own (C#) application. I can interact with Rhino via their interfaces and can instantiate GH this way. But how can I tell GH to simply "load a ghx file" without using the GH GUI? My hope is that after loading the ghx, the rest of the interaction can be done via input text files. Its almost unbelivable that a s…