Working with Object Services - Entity Framework 6 Recipes - page 246

var invoice2 = new Invoice { BilledTo = "Jim Stevens",
InvoiceDate = DateTime.Parse("9/21/2013") };
var invoice3 = new Invoice { BilledTo = "Juanita James",
InvoiceDate = DateTime.Parse("9/23/2013") };
context.LineItems.Add(new LineItem { Cost = 99.29M,
Invoice = invoice1 });
context.LineItems.Add(new LineItem { Cost = 29.95M,
Invoice = invoice1 });
context.LineItems.Add(new LineItem { Cost = 109.95M,
Invoice = invoice2 });
context.LineItems.Add(new LineItem { Cost = 49.95M,
Invoice = invoice3 });
context.SaveChanges();
// display the line items
Console.WriteLine("Original set of line items...");
DisplayLineItems();
// remove a line item from invoice1's collection
var item = invoice1.LineItems.ToList().First();
invoice1.LineItems.Remove(item);
context.SaveChanges();
Console.WriteLine("\nAfter removing a line item from an invoice...");
DisplayLineItems();
// remove invoice2
context.Invoices.Remove(invoice2);
context.SaveChanges();
Console.WriteLine("\nAfter removing an invoice...");
DisplayLineItems();
// remove a single line item
context.LineItems.Remove(invoice1.LineItems.First());
context.SaveChanges();
Console.WriteLine("\nAfter removing a line item...");
DisplayLineItems();
// update a single line item
var item2 = invoice3.LineItems.ToList().First();
item2.Cost = 39.95M;
context.SaveChanges();
Console.WriteLine("\nAfter updating a line item from an invoice...");
DisplayLineItems();
}
}