private void Button_Click(object sender, RoutedEventArgs e)
{
seller Seller = new seller();
Seller = db.sellers.First(c => c.name == Combo_sherkat.SelectedItem.ToString());
Product jadid = new Product();
jadid.name = txt_name.Text;
jadid.unit = txt_unit.Text;
jadid.seller_id = Seller.Id;
db.Products.InsertOnSubmit(jadid);
db.SubmitChanges();
Dg_3.ItemsSource = db.Products;
}
partial void Deleteseller(seller instance);
partial void Updateseller(seller instance);
partial void Insertseller(seller instance);
