Best way to interact with Command Line application

You would need to redirect both the input and output streams, using Process; it is slightly trickier handling both, since you need to be careful that things aren't lost in the buffers (causing deadlock).

• MSDN : Redirecting input
• MSDN : Redirecting output
• Here's a basic alternative example.

You might also want to look at OutputDataReceived for event-based responses.