static void Main(string[] args)
{
c = new ContactClient();
c.BeginGetFirst10(new AsyncCallback(GetFirst10Completed), null);
c.BeginGetByContactId(1, new AsyncCallback(GetByContactIdCompleted), null);
c.BeginGetByContactId(10, new AsyncCallback(GetByContactIdCompleted), null);
c.BeginGetByContactId(100, new AsyncCallback(GetByContactIdCompleted), null);
c.BeginGetByContactId(1000, new AsyncCallback(GetByContactIdCompleted), null);
c.BeginGetByContactId(10000, new AsyncCallback(GetByContactIdCompleted), null);
Console.ReadKey();
}