Imports System.Xml

Public Class Form1
    Inherits System.Windows.Forms.Form


#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents lstEmails As System.Windows.Forms.ListBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.lstEmails = New System.Windows.Forms.ListBox()
        Me.SuspendLayout()
        '
        'lstEmails
        '
        Me.lstEmails.IntegralHeight = False
        Me.lstEmails.Location = New System.Drawing.Point(16, 16)
        Me.lstEmails.Name = "lstEmails"
        Me.lstEmails.Size = New System.Drawing.Size(264, 224)
        Me.lstEmails.TabIndex = 0
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 253)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lstEmails})
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ' where do we want to get the XML from...
        Dim filename As String = _
            "c:\7612\Chapter18\Address Book\bin\AddressBook.xml"

        ' open the document...
        Dim reader As New XmlTextReader(filename)

        ' move to the start of the document...
        reader.MoveToContent()

        ' start working through the document...
        Dim addressData As Collection, elementName As String
        Do While reader.Read

            ' what kind of node to we have?
            Select Case reader.NodeType

                ' is it the start of an element?
            Case XmlNodeType.Element

                    ' if it's an element start, is it "Address"?
                    If reader.Name = "Address" Then

                        ' if so, create a new collection...
                        addressData = New Collection()
                    Else

                        ' if not, record the name of the element...
                        elementName = reader.Name

                    End If

                    ' if we have some text, try storing it in the 
                    ' collection...
                Case XmlNodeType.Text

                    ' do we have an address?
                    If Not addressData Is Nothing Then
                        addressData.Add(reader.Value, elementName)
                    End If

                    ' is it the end of an element?
                Case XmlNodeType.EndElement

                    ' if it is, we should have an entire address stored...
                    If reader.Name = "Address" Then

                        ' try to create a new listview item...
                        Dim item As String
                        Try
                            item = addressData("firstname") & _
                                   " " & addressData("lastname")
                            item &= " (" & addressData("email") & ")"
                        Catch
                        End Try

                        ' add the item to the list...
                        lstEmails.Items.Add(item)

                        ' reset...
                        addressData = Nothing

                    End If

            End Select

        Loop
    End Sub
End Class
