public void DownloadContacts(string account_type_str, string username, string password, AccountDownloadListener notify)
{
DBManager db = new DBManager();
AccountDB account = db.AddOrUpdateAccountByUserPassAccTypeString(username, password, account_type_str);
if (account.Id > 0)
{
DownloadContacts(account, notify);
}
else
{
notify.NotifyStatusByUsername(username, DownloadStatus.DATABASE_ERROR, "Database Error");
}
}