How to determine if a socket is disposed

[John J. Hughes II]

In my code I have the below callback. The socket I am connected to is
dropped by the other end it would be nice to not set off the exception. As
you can see from the code I check if r is null and if the async state is
null but I am still getting the below error.

Is there a better way of handling this?

Regards,
John

Code:
private void Send_Callback(S ystem.IAsyncRes ult r)
{
try
{
if(r!=null && r.AsyncState != null)
((Socket)r.Asyn cState).EndSend (r);
}
catch(System.Th reading.ThreadA bortException)
{
System.Diagnost ics.Debug.Write Line("Monitor thread worker (Send
callback):Abort ing");
}
catch(Exception ex)
{
this.onExceptio n(ex);
Utils.frmError. WriteError("Mon itor thread worker (Send callback):", ex);
}
}

Error:

Exception:Canno t access a disposed object named "System.Net.Soc kets.Socket".
Object name: "System.Net.Soc kets.Socket".
Stack Trace: at System.Net.Sock ets.Socket.EndS end(IAsyncResul t
asyncResult)
at RAMSComThrd.Mon itorThrdWorker. Send_Callback(I AsyncResult r) in
MonitorThrd.cs: line 264
Source:System