Hello,

I'm currently reading on .NET data binding and I'm trying to do one of the
sample programs in the book. There is a text box bound to a property of an
array, and a previous/next button. The book mentions that if there are many
controls bound to the same element I do not have to take care of anything
and the values will be synchronized automatically. It does work, however I
need to go to the next row and then go back to see my change applied on all
the text boxes.

I also tried changing the array in code to see if the form would be updated
to reflect my changes, but it is not updated.

Finally, I also tried hooking the CurrencyManager class to see if I could
get the ItemChanged() event, but I'm only getting the CurrentChanged()
event.

I saw some post regarding the need to have a <PropertyName>Changed event,
but this did not help. Here's part of my code. Am I doing anything wrong? Is
this the expected behaviour? If so, how can I force the databinding to
resynchronize? And finally, when would the ItemChanged event fire?

Thanks!

Public Class TrainingForm
   Inherits System.Windows.Forms.Form

   Private m_Candidates() As Candidate = _
       {New Candidate("Bill Gates", "305"), _
       New Candidate("Steve Ballmer", "320")}

   Private WithEvents m_CurrencyManager As CurrencyManager

   Private Sub TrainingForm_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Load
       CandidateName.DataBindings.Add("Text", m_Candidates,
"CandidateName")
       ExamNumber.DataBindings.Add("Text", m_Candidates, "ExamNumber")
       TextBox1.DataBindings.Add("Text", m_Candidates, "ExamNumber")
       Label3.DataBindings.Add("Text", m_Candidates, "ExamNumber")

       m_CurrencyManager = DirectCast(Me.BindingContext.Item(m_Candidates),
CurrencyManager)
   End Sub

   Private Sub NextButton_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles NextButton.Click
       Me.BindingContext(m_Candidates).Position += 1
   End Sub

   Private Sub PreviousButton_Click(ByVal sender As Object, ByVal e As
System.EventArgs) Handles PreviousButton.Click
       Me.BindingContext(m_Candidates).Position -= 1
   End Sub

   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
       m_Candidates(0).ExamNumber = "123"
   End Sub

   Private Sub m_CurrencyManager_ItemChanged(ByVal sender As Object, ByVal
e As System.Windows.Forms.ItemChangedEventArgs) Handles
m_CurrencyManager.ItemChanged
       MsgBox("Item Changed")
   End Sub

   Private Sub m_CurrencyManager_CurrentChanged(ByVal sender As Object,
ByVal e As System.EventArgs) Handles m_CurrencyManager.CurrentChanged
       MsgBox("Current changed")
   End Sub
End Class

Public Class Candidate
   Private m_ExamNumber As String
   Private m_CandidateName As String

   Public Event ExamNumberChanged As EventHandler
   Public Event CandidateNameChanged As EventHandler

   Public Property ExamNumber() As String
       Get
           Return m_ExamNumber
       End Get
       Set(ByVal Value As String)
           m_ExamNumber = Value
           RaiseEvent ExamNumberChanged(Me, New EventArgs)
       End Set
   End Property

   Public Property CandidateName() As String
       Get
           Return m_CandidateName
       End Get
       Set(ByVal Value As String)
           m_CandidateName = Value
           RaiseEvent CandidateNameChanged(Me, New EventArgs)
       End Set
   End Property

   Public Sub New(ByVal candidateName As String, Optional ByVal examNumber
As String = "")
       m_CandidateName = candidateName
       m_ExamNumber = examNumber
   End Sub
End Class