Socket.Close()

hello, as i understand it in C# u pass a copy of the reference by default,
no for my Example

iv'e got 2 Forms witch in the first a Socket connects and then is being passed in the constractor to the other form

now as i understand it they both have a reference to the same place in memory ,
now in the second form i call Socket.Close()
when the second form closes , the first form is up

and the socket witch is used there was of course set to close, i want to detect that status of the socket
something like if(Socket.Closed)

this is because in some situations i Call Socket.Disconnect(true) , and when errors occur i call Socket.Close()

my questions are :
1) how to detect if a socket is closed and not disconnected on The side it was closed on,
(please try to understand that i could well of said a oledb connection,the socket is not
the issue as much as detecting if a closeable object was closed)
2) can the reference of the Socket object be set to null , then the other Socket would also reference null and that i could detect