Application which can support Ethernet

Question

Hi, I've got a huge problem, Im not familiar with c# and despite that in my master thesis I have to create an application which will use ethernet connection. To be more specific - Ive got two modems Microhard IP2421 (each connected by ethernet cable to one computer) so when I go to the 'network environment' from windows I can see each of the computers. My task is to create an application which will allow me to connect to the other computer (from the application level) and for example send some files from one computer to another. Ive got IP addresses of my modems so if someone can help me I can give those numbers to apply them into program. It would be nice to create a list in application which will allow me to decide to which computer I want to 'go inside' and send files or edit something