using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using SFDC;

namespace SfSoapCore
{
    class Program
    {
        static string userName = "";
        static string password = "";
        static string securityToken = "";
        static SoapClient sc;
        static loginResponse lresp;
        static LoginResult lres;
        static LoginScopeHeader lsr = null;

        static void Main(string[] args)
        {
            sc = new SoapClient();
            Run();
        }

        static async void Run()
        {
            Task<loginResponse> loginTask = new Task<loginResponse>(SfLogin);
            loginTask.Start();
            lresp = await loginTask;
            lres = lresp.result;
            string serverUrl = lres.serverUrl;
            string sessionId = lres.sessionId;
            Console.WriteLine("Break");
        }

        static async loginResponse SfLogin()  //ERROR 'return type of an async method must be void, Task or Task<T>'
        {
            loginResponse lr = await sc.loginAsync(null, userName, password + securityToken);
            return lr;
        }

    }
}