nettcpbinding - How can I provide server-side administrative control of WCF clients? -

i have wcf, tcp-based client server application (self-hosted) in communication occurs via callbacks , instancecontextmode persession. want provide admin interface app allow administrator view details of connected users , provide degree of administrative control (for example forcibly disconnecting session).

since i'm using callbacks, each client proxy gives server instance context via constructor. example, client instantiates proxy server using:

public class clientcallbackhandler : imyservercallback {                 proxy = new myserviceclient(new instancecontext(this)); 

at server side retrieve context using:

var currencontext = operationcontext.current; 

my initial thoughts implement singleton 'sessionadmin' class maintains collection of operationcontext objects (i.e. - holds reference context of each connected client). every new client session register same instance of 'sessionadmin' class, thereby providing central class has access client sessions.

this works degree, @ various points when access collection of 'operationcontext' objects clients details or perform other operation notice context throwing 'object disposed' exceptions.

my question firstly, above sound reasonable way of providing server-side administrative control on wcf sessions? if so, how can maintain collection of client sessions or contexts on server-side without objects being disposed? example of problem is:

foreach(var context in mycontextcollection) {     displayclientdetails(context);     ... }  public void displayclientdetails(operationcontext context) {     var sessionid = context.sessionid;  //no problem here     var user = context.servicesecuritycontext.primaryidentity.name;  //servicesecuritycontext has been disposed