gds Works

Environment: CLSA .NET and Windows Form

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The original sample code illustrated the use of Application.IdleSync() to toggle the save button in a BusinessBaseCollection when editing a specific editable object. I've noticed when the mouse is moved the application.IdleSync() handler is triggered and I find it ineffecient.

Trying to find an efficient way, I noticed that BusinessBaseCollection overrides the OnListChanged Event. So I changed my IdleSync handler to OnListChanged.

See below for illustration:

In windows form level, I've created a method name OnListChanged()

Private Sub OnListChanged(ByVal sender As Object, ByVal e As System.ComponentModel.ListChangedEventArgs)
 btnSave.Enabled = mCustomer.IsSavable
 'Add the code for the Broken Rules Error Provider
End Sub

After retrieving records from the database, pattern this code just replace it with your own variables.

mCustomer = Customers.GetCustomers()
'Needs to be remove first
RemoveHandler mCustomer.OnListChanged, AddressOf OnListChanged
AddHandler mCustomer.OnListChanged, AddressOf OnListChanged

Before closing the form alway remove the added handler, it can be placed on Form_Close() event.

RemoveHandler mCustomer.OnListChanged, AddressOf OnListChanged