Increase concurrent requests on DropNet

Question

I have several giant folders saved in DropBox with over 10k files in them. I want to check if there is a list of files there, but I can not get the metadata in the parent folder, because I'm above the 10k limit.

So, I wrote code to check for the presence of each file in the file list.

I can’t understand how many requests will be executed simultaneously and how can I increase this number to the maximum that my machine can handle?

foreach(string f in files)
            {


                client.GetMetaDataAsync("/blah/blah/" + f, (response) =>
                {
                    found.Add(f);
                    count++;
                    Console.WriteLine("{0} of {1} found - {2}", count, files.Count, f);
                },
                (error) =>
                {
                    if (error.Message.Contains("[NotFound]"))
                    {
                        missing.Add(f);
                        count++;
                        Console.WriteLine("{0} of {1} missing - {2}", count, files.Count, f);
                    }
                    else
                    {
                        Console.WriteLine("Unknown error");
                    }
                });
            }