C# Multithreading API calls

Question

I am multithreading a list of API calls in Python like so:

from requests_toolbelt.threaded import pool
import multiprocessing
import api_credentials
import queue

def multi_process(urls)

    cores_to_use = multiprocessing.cpu_count()
    if cores_to_use > 10: cores_to_use = 10

    jobs = queue.Queue()
    for url in urls():
        jobs.put({'method': 'GET', 'url': url, 'auth':(api_credentials.username, api_credentials.password)
    
    pool_of_jobs = pool.Pool(job_queue=jobs, num_processes=cores_to_use)
    pool_of_jobs.join_all()

    return pool_of_jobs.responses()

What is the equivalent way of doing the above in C#?

I am getting the number of cores from:

int cores_to_use = Environment.ProcessorCount;

but I haven't found any clear example to achieve the above in C#.