c# - entity saveChanges not updating database -

i following tutorial using entity framework in c# , having number of issues.

my first issue not access .load() or addobject() methods through entity. after searching found far has seemed help:

.net framework 4.5 addobject() not appear

after continuing on tutorial having issue when trying save new record database.

        using (northwndentities ctx = new northwndentities())         {              var customers = c in ctx.customers.include("orders")                             c.city == "london"                             select c;              //adds customer             customer newcustomer = new customer { customerid = "joen", city = "london", contactname = "joe n", companyname = "acme" };             ctx.customers.addobject(newcustomer);              ctx.savechanges();               foreach (customer customer in customers)             {                 //customer.orders.load();                 console.writeline("customer {0} has {1} orders {2}", customer.contactname, customer.orders.count(), customer.phone);             } 

when code runs displays newly added customer database not updated.

i have tried suggested solutions on entity framework not save object don't have addto method in entity.

using create on dbcontext more appropriate , may resolve issue:

customer newcustomer = ctx.customers.create(); newcustomer.customerid = "joen"; ..etc, etc ctx.customers.add(newcustomer); ctx.savechanges();