VK Net authorization freezes

Делаю софт для ВК и при вводе данных в текстовой документ приложение зависает, как исправить?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using VkNet;
using VkNet.Model.RequestParams;
using VkNet.Model;
using System.IO;

namespace WindowsFormsApp1
{
public class Accounts
{
public VkApi _api = new VkApi();
public void Auth()
{
var data = File.ReadAllLines("accounts.txt");
foreach (var acc in data)
{
var login = acc.Split(':')[0];
var pass = acc.Split(':')[1];

_api.Authorize(new ApiAuthParams()
{
Login = login,
Password = pass,
ApplicationId = 3116505,
Settings = Settings.All
});

if (_api.IsAuthorized)
Log.Push("Authorize good");
else
Log.Push("No authorize");
}
}
}
}

Code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using VkNet;

using VkNet.Model.RequestParams;

using VkNet.Model;

using System.IO;



namespace WindowsFormsApp1

{

    public class Accounts

    {

        public VkApi _api = new VkApi();

        public void Auth()

        {

            var data = File.ReadAllLines("accounts.txt");

            foreach (var acc in data)

            {

                var login = acc.Split(':')[0];

                var pass = acc.Split(':')[1];



                _api.Authorize(new ApiAuthParams()

                {

                    Login = login,

                    Password = pass,

                    ApplicationId = 3116505,

                    Settings = Settings.All

                });



                if (_api.IsAuthorized)

                    Log.Push("Authorize good");

                else

                    Log.Push("No authorize");

            }

        }

    }

}