public VkApi Authorize(string login, string password)
        {
            try
            {

                vkApi.Authorize(new ApiAuthParams
                {
                    ApplicationId = 6612352,
                    Login = login,
                    Password = password,
                    Settings = Settings.All
                });
                return vkApi;

            }
            catch (VkApiException)
            {
                return null;
            }
        }