using System;

public class Program

{

    private Process _process;

    private void StartProcess (){

        (new Thread(() => {

            // initialize process etc...

            _process.OutputDataReceived += new DataReceivedEventHandler((o,d)=> {

                // Parse and handle data...

            });

            // etc...

        })).Start();

    }

    public async Task<int> GetInt () {

        // Causes the process to generate an output to stdout

        // which is parsed by the DataReceivedEventHandler.

        // How would I' make this async?

        _process.StandardInput.WriteLine("get int");

    }

}