program throws not found or not supported exception while using Managment Event

[diyasher]

hello

while running program that use system.manageme nt namespace and holds management event the exception throws "not found" and some time "not supported" unhandled management exception on management event start() method, i am using windows xp professional sp2, the sample code is

class Program
{
public static void Main(string[] args)
{
ManagementScope scope = new ManagementScope ("root\\default ");
WqlEventQuery q = new WqlEventQuery() ;
q.EventClassNam e = "RegistryTreeCh angeEvent";
q.Condition = @"Hive='HKEY_LO CAL_MACHINE' and RootPath='Softw are\\Policies'" ;

using (ManagementEven tWatcher w = new ManagementEvent Watcher(scope,q ))
{
w.EventArrived += new EventArrivedEve ntHandler(EvLog EventArrived);
w.Start(); //exception throws on this line
Console.ReadLin e(); // Block this thread for test purposes only....
w.Stop();

}
}
static void EvLogEventArriv ed(object sender, EventArrivedEve ntArgs e)
{
//Get the Event object and display it
foreach (PropertyData pd in e.NewEvent.Prop erties)
{
//if (pd.Name.ToLowe r() == "rootpath")
Console.WriteLi ne("{0} = {1}", pd.Name, pd.Value);
}
}
}


these types of program running correctly when i am using xp home sp2, but when change operating system these program fail to run..

plz help me if u have any idea i am very tense bcoz these exception is throw in my final project.

thanks aton
bye

[Plater]

Where does the exception occur? Like on what call?

What system are you trying to run it on?
I ran it fine on XP pro sp2, perhaps you must have sp2 for it to run?

[diyasher]

i am running on windows xp professional sp2.
exception occur on statement
w.start();

Where does the exception occur? Like on what call?

What system are you trying to run it on?
I ran it fine on XP pro sp2, perhaps you must have sp2 for it to run?

[Plater]

Yeah, sorry, I see that now.

Well I looked up and saw:
.NET Framework Security
Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

So maybe you need to change permisions?

[hbxtlhx]

using (ManagementEven tWatcher w = new ManagementEvent Watcher(scope,q ))
{
....
}


w is disposed!
make it global!

for example:

private ManagementEvent Watcher w;

...

w=w ManagementEvent Watcher(scope,q );
w....