/// <summary>
/// Deletes several contacts from the list.
/// </summary>
/// <param name="contacts"></param>
/// <returns></returns>
public async Task <bool> DeleteContactsAsync(List <Models.Contact> contacts)
{
await ConnectAsync();
return(await _client.DeleteContacts(contacts.Select(contact => new InputUserContactConstructor(contact.Id)).Cast <InputUser>().ToList()));
}