SalesforceClient-Login.cs

public void Login()
{
    String jsonResponse;
    using (var client = new HttpClient())
    {
        var request = new FormUrlEncodedContent(new Dictionary<string, string>
            {
                {"grant_type", "password"},
                {"client_id", ClientId},
                {"client_secret", ClientSecret},
                {"username", Username},
                {"password", Password + Token}
            }
        );
        request.Headers.Add("X-PrettyPrint", "1");
        var response = client.PostAsync(LOGIN_ENDPOINT, request).Result;
        jsonResponse = response.Content.ReadAsStringAsync().Result;
    }
    var values = JsonConvert.DeserializeObject<Dictionary<string, string>>(jsonResponse);
    AuthToken = values["access_token"];
    InstanceUrl = values["instance_url"];
}