type definition problem

Question

Hi, I receive "Type 'managementeventwatcher' is not defined" error in compilation.
My code is as below:
Imports System.Runtime.InteropServices
Imports System
Imports System.management
'Imports System.ManagementEventWatcher
Namespace monitordrives

End Namespace

Module Program
Class program
Public Enum EventType
Inserted = 2
Removed = 3
End Enum

    Sub Main()
        Dim watcher As ManagementEventWatcher = New ManagementEventWatcher()
        Dim query As WqlEventQuery = New WqlEventQuery()
        AddHandler watcher.EventArrived, AddressOf watcher_EventArrived

        watcher.Query = query
        watcher.Start()
        Console.ReadKey()

    End Sub





    Private Sub watcher_EventArrived(ByRef sender As Object, ByRef e As EventArrivedEventArgs)

        Dim driveName As String = e.NewEvent.Properties("DriveName").Value.ToString()
        Dim eventType As EventType = CType((Convert.ToInt16(e.NewEvent.Properties("EventType").Value)), EventType)
        Dim eventName As String = [Enum].GetName(GetType(EventType), eventType)
        Console.WriteLine("{0}: {1} {2}", DateTime.Now, driveName, eventName)
    End Sub
    'Sub Main()
    '   Console.WriteLine("Port Connected")
    'End Sub
    'Public Class socket
    'Dim usbdevice As socket = New socket()
    'Event usbarrival(ByVal iev As Integer)
    '   Sub usbdevice_usbarrival()
    '        AddHandler usbdevice.usbarrival, AddressOf Me.usbdevice_usbarrival

    '  End Sub
    'End Class
End Class

End Module
This error is received five times for other parameters anywhere I used As 'Type'.
Please help me.
Thanks

Answer 1

Open the References for the project in the Solution
Explorer and add a checkmark next to System.Management.

• Wayne

Answer 2

You shouldn't have to copy anything. How did you
look for System.Management? Did you open the
References by right-clicking on that node in the
project tree in the Solution Explorer window?

Then choose "Add Reference" from the menu.

Scroll down the Framework list and you should find
System.Management.

• Wayne

Answer 3

If you can't find System.Management then perhaps the project is .NET Core (or regular .NET Framework) and if so add the reference via NuGet.

Link to NuGet package.

Answer 4

Hi ,thanks a part of my problem is resolved.Now I have event 'load' can not be found error and 'msgbox' is not declared error.this is the line concerns my first error:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
and the second error:
MsgBox(ex.Message)
Which libraries I have to install?
Please help me.
Thank you very much

Answer 5

No additional libraries are needed. You can try using MessageBox.Show instead and would recommend using Form Shown event rather than Form Load.