using System;

public class Program

{

    public virtual async Task<List<Fields>> GetPicklistFields(string sObject, string oField)

    {

        List<Fields> fields = null;

        HttpClient client = new HttpClient();

        List<string> items = null;

        var auth = Auth.Authorize().Result;

        string query = string.Format("{0}/services/data/v41.0/sobjects/{1}/describe", auth.instance_url, sObject);

        HttpRequestMessage req = new HttpRequestMessage(HttpMethod.Get, query);

        req.Headers.Add("Authorization", string.Format("Bearer {0}", auth.access_token));

        req.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        try

        {

            HttpResponseMessage resp = await client.SendAsync(req);

            if (resp.StatusCode != HttpStatusCode.OK)

            {

                throw new Exception(string.Format("Server error (HTTP {0}: {1}).",

                                                  resp.StatusCode, resp.Content));

            }

            var jsonStream = await resp.Content.ReadAsStringAsync();

            JObject joResponse = JObject.Parse(jsonStream);

            JArray array = (JArray)joResponse["fields"];

            foreach (JObject obj in array)

            {

                //no fucking clue

            }

        }

        catch (Exception ex)

        {

            var msg = ex.Message;

        }

        return fields;

    }

}