Both Biz obj A and B are same form and the property on A is pointing to B, Biz Obj A is also the Biz obj in a Bus Binding source that is the data source for a Data Entry Grid.

Biz object A raises and handles a value changed event for one of the fields in the grid. In the handled code it does some calculation and then try's to update some values on biz obj B. 

It appears the BBS is creating a new instance of biz obj A so that when Biz Obj A handles the value changed event it is actually being handled by a new instance of A that the Bus binding source creates and thus doesnt "know" about B.

I have just started trying to think of the best way to handle this.. any ideas?

Thanks

Paul

I have business object (A)

A has an Event called wishiworked that is raised when some field's value is changed.

I drop A onto a form

I drop a business binding source and set the bus obj property to A

I drop a grid and wire it up to the BBS.

I change the value of the field that the raises the wishiworked event. but because the event is raised in a new instance my form code below will not work.

I have the following code in the form.

Private sub youwillneverwork(By Val whatever event args I want) handles businessobjectA.wishiworked

msgbox("This will never fire from the Business Binding Source!!!!!!!")

end sub

Maybe that makes a bit more sense>?

Maybe I'm missing something, but the event doesn't seem to get raised either.

AddHandler Me.CurrentView.ListChanged, AddressOf TestListChanged

Private Sub TestListChanged(ByVal sender As Object, ByVal e As System.ComponentModel.ListChangedEventArgs)

Diagnostics.Debug.WriteLine(e.ListChangedType.ToString)

End Sub

I think my head is about to explode. Who thought handling one event could cause this much trouble. The seas are too rough to fish and it is to hot to sit in a treestand so I guess I'm stuck trying to get this to work

Any ideas you might have on how to make this work would be great

Dim _CurrentView As DataView

Private Sub BusinessObject1_CurrentDataTableRefilled()
    If Me._CurrentView IsNot Nothing Then RemoveHandler Me._CurrentView.ListChanged, AddressOf TestListChanged
    Me._CurrentView = Me.BusinessObject1.CurrentView
    AddHandler Me._CurrentView.ListChanged, AddressOf TestListChanged
End Sub

The solution you suggested works however it still leaves me with a problem, Any property values that are set in the first BO are gone in the new instance that the business binding source creates.

for example I have a property that references another bus obj,

<Category("Action Labor : Related Business Objects"), _

DescriptionAttribute("Check Detail Business Object")> _

Public Property CheckDetailBiz() As Payroll.Business.BoCheckDetail

Get

If _CheckDetail Is Nothing Then

'Do not create a new instance!!!

End If

Return _CheckDetail

End Get

Set(ByVal value As Payroll.Business.BoCheckDetail)

_CheckDetail = value

End Set

End Property

I have a custom Bindable Property

There are 2 ways to accomplish that:

1)  When you add a handler to the list changed on the data table, add a new column to the data table that stores types of Object:

Me.CurrentDataTable.Columns.Add(New DataColumn("_CheckDetail", GetType(Object)))

This will allow you to store the _CheckDetail business object within the row that is using it.  So, each instance used by the BBS points to the correct _CheckDetail instance (obviously, you change your property to return Me.CurrentRow("_CheckDetail") and set it).

2)  The other option would be to created a shared property called _CheckDetails that is a dictionary of BoCheckDetail:

Private Shared _CheckDetails As New Dictionary(Of Integer, BoCheckDetail)

You would store all of the check detail business objects in the dictionary and access them by the PK of the current record.  This option would be secondary to the first since you would need to remember to clean out the dictionary when you're done because it's shared, so the garbage collector would never clean up the items in it unless you explicitly removed them.