non blocking sockets

[user]

Hello
I have socket:
System.Net.Sock ets.Socket oSocket = new
Socket(IPAddres s.Any.AddressFa mily,SocketType .Stream,Protoco lType.Tcp); IPEndPoint
endPoint = new IPEndPoint(IPAd dress.Parse(ip) ,portNum);
oSocket.Blockin g=false;
oSocket.Connect (endPoint);
.....
while (CountinueThrea d)
{
int BytesRead = oSocket.Receive (bytes);
....
Thread.Sleep(20 0);
}

as far as i understeand: if there is nothing to Receive thread
continues. How do i know there is nothing to receive ? Can i set timeout
in any way ? Is it possible that i will receive only part of packet ?

The main problem is that using non-blocking socket here my program thru
exeption:
" System.Net.Sock ets.SocketExcep tion: Non-blocking Socket operation
could not been finished, but was finished imediately".
Why ?

Other problem: when i used blocking socket and try to set:
LingerOption lingerOption = new LingerOption(tr ue, 1);
oSocket.SetSock etOption(Socket OptionLevel.Soc ket,
SocketOptionNam e.Linger, lingerOption);

nothing changed, when in other thread i closed socket, after about 3
second receive function thru exeption that socket was closed.
When i tried to set that time to 10 seconds, noting changed too
(response was after 3 second too).
How can i set time after Socket.Receive notice that connection is broken ?

Thanx