TextBox.Modified in DataGrid

[andrea96]

I am attempting to use some code that I found in this forum to update the DataGrid's DataSource when a cell changes, but the row does not change.

Here is the code.

Private Sub TextBoxValidating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs)
    Dim tbc As DataGridTextBoxColumn = _
        CType(dg.TableStyles(0).GridColumnStyles 
        (dg.CurrentCell.ColumnNumber), DataGridTextBoxColumn)

    If Not tbc.TextBox Is Nothing AndAlso tbc.TextBox.Modified Then
        Dim bm As BindingManagerBase = _
            dg.BindingContext(dg.DataSource, dg.DataMember)
        CType(bm.Current, DataRowView).Row.Item(tbc.MappingName) = _ 
            tbc.TextBox.Text
    End If
End Sub

However, tbc.TextBox.Modified is always False, so I am never hitting the code. Am I supposed to set the Modified property at some point, or should it be set automatically?

Thanks for your help,
Andrea