Entity Data Model saving data

Hi Experts,

I think im missing something simple. I have created an entity data model that gets filled from an SQL server database, filled 2 datagrids using the tables in the data model. How do I get any changes within the grid to fire back into my SQL server database?

My (generated) code so far is....

 Private Function GetWPFtblSmartQuoteHeadersQuery(OMSystemEntities As hello.OMSystemEntities) As System.Data.Objects.ObjectQuery(Of hello.WPFtblSmartQuoteHeader)

        Dim WPFtblSmartQuoteHeadersQuery As System.Data.Objects.ObjectQuery(Of hello.WPFtblSmartQuoteHeader) = OMSystemEntities.WPFtblSmartQuoteHeaders
        'Update the query to include WPFtblSmartQuoteLines data in WPFtblSmartQuoteHeaders. You can modify this code as needed.
        WPFtblSmartQuoteHeadersQuery = WPFtblSmartQuoteHeadersQuery.Include("WPFtblSmartQuoteLines")
        'Returns an ObjectQuery.
        Return WPFtblSmartQuoteHeadersQuery
    End Function

    Private Sub Window_Loaded(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded

        Dim OMSystemEntities As hello.OMSystemEntities = New hello.OMSystemEntities()
        'Load data into WPFtblSmartQuoteHeaders. You can modify this code as needed.
        Dim WPFtblSmartQuoteHeadersViewSource As System.Windows.Data.CollectionViewSource = CType(Me.FindResource("WPFtblSmartQuoteHeadersViewSource"), System.Windows.Data.CollectionViewSource)
        Dim WPFtblSmartQuoteHeadersQuery As System.Data.Objects.ObjectQuery(Of hello.WPFtblSmartQuoteHeader) = Me.GetWPFtblSmartQuoteHeadersQuery(OMSystemEntities)
        WPFtblSmartQuoteHeadersViewSource.Source = WPFtblSmartQuoteHeadersQuery.Execute(System.Data.Objects.MergeOption.AppendOnly)
    End Sub

Many Thanks.