Check if this Dynamic DIV-tag integration helps. I guess, even if you integrate qv with .net app the working of direct discovery would be on qlik engine and not on .net. You might have to buy workbench license though.
I think this is like a "QlikSense Mashup", isn´t it? My question is about to combine embedded app with Direct Discovery. Reading your response I think that is necessary to have a connection between the app and the QV Server (and it has sense), because is the server who makes all the work refreshing data.
Thank you very much!