vb.net - Handling AD Error When Not Connected -

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i'm using below code logge don user's logon name. works fine when connected network/domain. when offline, error on 3rd line:

principalserverdownexception unhandled

the server not contacted.

private sub form1_load(sender object, e eventargs) handles mybase.load     dim currentaduser system.directoryservices.accountmanagement.userprincipal     currentaduser = system.directoryservices.accountmanagement.userprincipal.current     dim displayname string = currentaduser.givenname & " " & currentaduser.surname     label5.text = displayname     label4.text = getuserproperties() end sub

how can check, , return userful error user, such "not on network" or "not connected domain", exit? i've tried below, gives same error:

private sub form1_load(sender object, e eventargs) handles mybase.load     dim currentaduser system.directoryservices.accountmanagement.userprincipal     if system.directoryservices.accountmanagement.userprincipal.current nothing         msgbox("network error: no connection domain")         application.exit()     else ....     end if end sub

use try/catch

    try         dim currentaduser system.directoryservices.accountmanagement.userprincipal         currentaduser = system.directoryservices.accountmanagement.userprincipal.current         dim displayname string = currentaduser.givenname & " " & currentaduser.surname         label5.text = displayname         label4.text = getuserproperties()     catch ex exception         msgbox(...)     end try

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