private void ProductsButton(object sender, RoutedEventArgs e)
 {
     using (var db = new NorthwindEntities1())
     {
         product = db.Products.ToList();
         ProductsList.DisplayMemberPath = "ProductName";
         ProductsList.ItemsSource       = product;
     }
 }
 private void CustomersButton(object sender, RoutedEventArgs e)
 {
     using (var db = new NorthwindEntities1())
     {
         customers = db.Customers.ToList();
         CustomersList.DisplayMemberPath = "ContactName";
         CustomersList.ItemsSource       = customers;
     }
 }
 private void SuppliersButton(object sender, RoutedEventArgs e)
 {
     using (var db = new NorthwindEntities1())
     {
         supplier = db.Suppliers.ToList();
         SuppliersList.DisplayMemberPath = "CompanyName";
         SuppliersList.ItemsSource       = supplier;
     }
 }
 private void EmployeeButton(object sender, RoutedEventArgs e)
 {
     using (var db = new NorthwindEntities1())
     {
         employees = db.Employees.ToList();
         EmployeesList.DisplayMemberPath = "FirstName";
         EmployeesList.ItemsSource       = employees;
     }
 }
 private void OrdersList_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     using (var db = new NorthwindEntities1())
     {
     }
 }