private void SelectClick(object sender, RoutedEventArgs e)
{
LoginDataContext bd = new LoginDataContext();
grid.ItemsSource = null;
grid.ItemsSource = (from g in bd.GrupoUsuario select g).ToList();
}
private void InsertClick(object sender, RoutedEventArgs e)
{
GrupoUsuario g = new GrupoUsuario();
g.Id = int.Parse(txtId.Text);
g.Descricao = txtDesc.Text;
LoginDataContext bd = new LoginDataContext();
bd.GrupoUsuario.InsertOnSubmit(g);
bd.SubmitChanges();
}