How to solve the error number 10035?

I write two programsne is to send data,another is to receive
data,and I register a message function,Look:

Code:

WSAAsyncSelect(m_sock,m_hWnd,WM_RNET,FD_READ);
void CTcpFSDlg::OnRNet(WPARAM wParam,LPARAM lParam)
{
         char recvbuf[100];
         int retval,err;
         while(1)
	{
		retval=recv((SOCKET)wParam,recvbuf,100,0);
		if(retval==SOCKET_ERROR)
		{
			err=WSAGetLastError();
			str.Format("recv error=%d",err);
			MessageBox(str);
			break;
		}
		MessageBox(recvbuf);
	}
}

when I send one message,this program can receive it,but it
receive a error number 10035,when I send more than one message,
I only receive the first message and error number 10035,
I want to know how to solve it?

Windows Sockets Error Codes

WSAEWOULDBLOCK
10035

Resource temporarily unavailable.

This error is returned from operations on nonblocking sockets that cannot be completed immediately, for example recv when no data is queued to be read from the socket. It is a nonfatal error, and the operation should be retried later. It is normal for WSAEWOULDBLOCK to be reported as the result from calling connect on a nonblocking SOCK_STREAM socket, since some time must elapse for the connection to be established.

Google is your friend.

Tim S.