public void acceptGroupInvitation(int reqSeq, string groupId)
{
#if !SILVERLIGHT
send_acceptGroupInvitation(reqSeq, groupId);
recv_acceptGroupInvitation();
#else
var asyncResult = Begin_acceptGroupInvitation(null, null, reqSeq, groupId);
End_acceptGroupInvitation(asyncResult);
#endif
}
#if SILVERLIGHT