Suggestions on WMI

[sapator]

Hi.
I'm using WMI to get remote processes on computers.
No, I can't use process class, search yesterday posts if you have questions.

So What I do is create the management class and then get the collection.
Something like this:

   Dim queryCollection1 As ManagementObjectCollection
        Dim searcher1 As ManagementObjectSearcher

  Dim propt As ObjectGetOptions
        propt = New ObjectGetOptions(Nothing, TimeSpan.MaxValue, True)
        Using manClass As New ManagementClass("\\testserver\root\cimv2", "Win32_PerfFormattedData_PerfProc_Process", propt)
            manClass.Scope.Options.EnablePrivileges = True
            manClass.Scope.Options.Impersonation = ImpersonationLevel.Impersonate
            manClass.Scope.Options.Username = "user"
            manClass.Scope.Options.Password = "pass"
            manClass.Scope.Options.Authority = "ntlmdomain:mydomain"
            Dim query As ObjectQuery
            query = New ObjectQuery(
                "SELECT * FROM Win32_PerfFormattedData_PerfProc_Process")
         
            searcher1 = New ManagementObjectSearcher(manClass.Scope, query)

            queryCollection1 = searcher1.Get()
          
        End Using

' Testing for values...
  For xx = 0 To 6 Step +1
       queryCollection1 = searcher1.Get()
  Next

        queryCollection1.Dispose()
        searcher1.Dispose()

The 2nd implementation is like so:

  Dim queryCollection1 As ManagementObjectCollection
  Dim searcher1 As New ManagementObjectSearcher


        Dim propt As ObjectGetOptions
        propt = New ObjectGetOptions(Nothing, TimeSpan.MaxValue, True)
        Dim scopper1 As New ManagementScope
        Dim query1 As New ObjectQuery
        Using manClass As New ManagementClass("\\testserver\root\cimv2", "Win32_PerfFormattedData_PerfProc_Process", propt)
            manClass.Scope.Options.EnablePrivileges = True
            manClass.Scope.Options.Impersonation = ImpersonationLevel.Impersonate
            manClass.Scope.Options.Username = "user"
            manClass.Scope.Options.Password = "pass"
            manClass.Scope.Options.Authority = "ntlmdomain:mydomain"
               
            scopper1 = manClass.Scope.Clone()
                            
        End Using

   query1.QueryString = "SELECT * FROM Win32_PerfFormattedData_PerfProc_Process"
    searcher1.Scope = scopper1
    searcher1.Query = query1
  For xx = 0 To 6 Step +1

        '' in or out of the loop? probably out 
        ' searcher1.Scope = scopper1
        ' searcher1.Query = query1

            queryCollection1 = searcher1.Get()
   Next

        queryCollection1.Dispose()
        searcher1.Dispose()

Now, this seems to work both ways , haven't tested in extend but it gets the collection.

My questions are:
1)Is this correct? And if so, which is better? I'm putting the ManagementClass and all the options and creds in a a using and then I get the results also outside the using. I do that because this will run with a timer every x seconds,
so it does not seem logical to get the ManagementClass again and again. I was not sure if it will work as the loop runs outside the using but seems to work, so is that correct?
2)Does anyone know how long this will keep working? Is there a time limit? I use Timespan.Maxvalue on ObjectGetOptions but i don't know if that is the way to go as I can't understand what the MSDN documentation is saying for ObjectGetOptions timeout