Retrieve emails using IMAPX VB.NET

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VB

IMAP

I tried to follow this article

What i am trying to do is retrieve emails using IMAPX.The problem is, when i create a class to handle all the function using this code :

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports System.Threading.Tasks
Imports ImapX
Imports ImapX.Collections
Imports System.Windows

Namespace ImapPackage

    Class ImapService

        Private Shared Property client As ImapClient

        Public Shared Sub Initialize()
            client = New ImapClient("imap.gmail.com", True)
            If Not client.Connect() Then
                Throw New Exception("Error connecting to the client.")
            End If
        End Sub

        Public Shared Function Login(ByVal u As String, ByVal p As String) As Boolean
            Return client.Login(u, p)
        End Function

        Public Shared Sub Logout()
            If client.IsAuthenticated Then
                client.Logout()
            End If

            MainWindow.LoggedIn = False
        End Sub

        Public Shared Function GetFolders() As List(Of EmailFolder)
            Dim folders = New List(Of EmailFolder)()
            For Each folder In client.Folders
                folders.Add(New EmailFolder With {.Title = folder.Name})
            Next

            client.Folders.Inbox.StartIdling()
            client.Folders.Inbox.OnNewMessagesArrived += AddressOf Inbox_OnNewMessagesArrived
            Return folders
        End Function

        Private Shared Sub Inbox_OnNewMessagesArrived(ByVal sender As Object, ByVal e As IdleEventArgs)
            MessageBox.Show($"A new message was downloaded in {e.Folder.Name} folder.")
        End Sub

        Public Shared Function GetMessagesForFolder(ByVal name As String) As MessageCollection
            client.Folders(name).Messages.Download()
            Return client.Folders(name).Messages
        End Function
    End Class
End Namespace

The exception i get :

1 • Type EMAILFOLDER is not defined
2 • Public event OnNewMessageArrived as EventHandler(Of IdleEVentArgs) is an event and cannot be called directly.Use a RaiseEvent statement

The 2nd problem is not that serious but how do i fix the 1st one ? What am i missing ?

What I have tried:

Whatever i tried is mentioned in the post above .