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copied!<p>Well, when a class implements <code>INotifyPropertyChanged</code>, the <code>BindingList<T></code> class raises its <code>ListChanged</code> event on each <code>PropertyChanged</code> event with a <code>ListChangedEventArgs</code> object whose <code>ListChangedType</code> property is equal to <code>ItemChanged</code>.</p> <p>Armed with this knowledge, I feel you should be able to accomplish what you want. (Where <code>ListChangedType == ListChangedType.ItemChanged</code>, pass the object at index <code>NewIndex</code> of the <code>BindingList<T></code> to your service.)</p> <hr> <p><strong>UPDATE</strong>: Below is a sample application I wrote to demonstrate that the <code>ListChanged</code> event <strong>is</strong> raised when an item is modified through the <code>DataGridView</code>:</p> <h3>The <code>CustomObject</code> class: a simple implementation of <code>INotifyPropertyChanged</code></h3> <pre><code>Imports System.ComponentModel Public Class CustomObject Implements INotifyPropertyChanged Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value OnPropertyChanged("Name") End Set End Property Protected Sub OnPropertyChanged(ByVal propertyName As String) RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName)) End Sub End Class </code></pre> <h3>The <code>DataBindingTestForm</code> class: a basic <code>Form</code> class with a <code>DataGridView</code> bound to a <code>BindingList(Of CustomObject)</code></h3> <pre><code>Imports System.ComponentModel Public Class DataBindingTestForm Private WithEvents _customObjects As New BindingList(Of CustomObject) Private Sub DataBindingTestForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim obj As New CustomObject obj.Name = "John" _customObjects.Add(obj) obj = New CustomObject obj.Name = "Bill" _customObjects.Add(obj) MainDataGridView.DataSource = _customObjects End Sub Private Sub _customObjects_ListChanged(ByVal sender As Object, ByVal e As ListChangedEventArgs) Handles _customObjects.ListChanged If Not e.ListChangedType = ListChangedType.ItemChanged Then Return Notify("ListChanged event fired. Index: {0}, Value: {1}", e.NewIndex, _customObjects(e.NewIndex).Name) End Sub Private Sub Notify(ByVal format As String, ByVal ParamArray args() As Object) MsgBox(String.Format(format, args)) End Sub End Class </code></pre> <p>In running the above demo application, when I change the value in a cell of the <code>DataGridView</code> (e.g., from "John" to "George"), a message box appears with the following text:</p> <pre><code>ListChanged event fired. Index: 0, Value: George </code></pre> <p>Try this out for yourself and let me know if you run into any further problems.</p>

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