Update SelectedItem Using EF - WPF C#

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C#

WPF

I am creating an application to get me started with WPF and using entity frameworks to allow CRUD operations.

So far I am able to add and delete items from a data-grid which loads the contents from a database.

But I'm having problems with my update method.

In the data-grid, when i select a row, and update it, it updates the first row of the table, not the row i selected (third row down for example).

I've posted the code snippets of what I think are important.

private void Page_Loaded(object sender, RoutedEventArgs e) 
{ 
        DBEntities context = new DBEntities();

        var orgTypeDetails = (from o in context.OrganisationTypeDetails
                              select o).ToList();

        dgOrgTypeDetail.ItemsSource = orgTypeDetails;
}

private void btnUpdateOrgTypeDetail_Click(object sender, RoutedEventArgs e) 
{ 
    OrganisationTypeDetail selected = dgOrgTypeDetail.SelectedItem as OrganisationTypeDetail;

        if (selected == null)
            MessageBox.Show("You must select a 'Type' before updating.");
        else
        {
                OrganisationTypeDetailUpdateView update = new OrganisationTypeDetailUpdateView();


                update.ShowDialog();
                Page_Loaded(null, null);
        }
    }

Any help would be much appreciated.

Many thanks, Greg.