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Specifying a method s first argument with the this keyword modifier will make that method an extension method. The extension method will appear as an instance method of any object with the same type as the extension method s first argument s data type. For example, if the extension method s first argument is of type string, the extension method will appear as a string instance method and can be called on any string object. Also keep in mind that extension methods can only be declared in static classes. Here is an example of an extension method: namespace Netsplore.Utilities { public static class StringConversions { public static double ToDouble(this string s) { return Double.Parse(s); } public static bool ToBool(this string s) { return Boolean.Parse(s); } } } Notice that both the class and every method it contains are static. Now you can take advantage of those extension methods by calling the static methods on the object instances as shown in Listing 2-15. Because the ToDouble method is static and its first argument specifies the this keyword, ToDouble is an extension method.

Assigns destination URL, method, and other optional attributes of a pending request Transmits the request, optionally with a string that can be posted or DOM object data Stops the current request Returns the string value of a single header label Returns a complete set of headers (labels and values) as a string Assigns a label/value pair to the header to be sent with a request

F igure 1 3- 8 . Mapping method arguments to class properties All our method arguments were already mapped by default to the appropriate class properties. Nice! Once you have mapped all the method arguments, click the OK button. You are now ready to insert Customer records using the InsertCustomer stored procedure. In Listing 13-3, we will create a new customer using the InsertCustomer stored procedure.

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NorthwindDataContext db = new NorthwindDataContext(); db.Log = Console.Out; Customer cust = new Customer { CustomerID = "EWICH", CompanyName = "Every 'Wich Way", ContactName = "Vickey Rattz", ContactTitle = "Owner", Address = "105 Chip Morrow Dr.", City = "Alligator Point", Region = "FL", PostalCode = "32346", Country = "USA", Phone = "(800) EAT-WICH", Fax = "(800) FAX-WICH"

In case this example doesn t seem to be doing anything significantly different than Listing 14-1, in Listing 14-1, the inserted object, which was a Customer, was inserted into a variable of type Table<Customer>. In Listing 14-2, the inserted object, which is an Order, is added to a variable of type EntitySet<Order>. Here are the results of Listing 14-2.

}; dbCustomersInsertOnSubmit(cust); dbSubmitChanges(); Customer customer = dbCustomersWhere(c => cCustomerID == "EWICH")First(); ConsoleWriteLine("{0} - {1}", customerCompanyName, customerContactName); // Restore the database dbCustomersDeleteOnSubmit(cust); dbSubmitChanges(); Notice that we are not specifying any namespace on the Customer class that we reference; therefore, we will be using the Customer class that exists in the same namespace as the project, which is the designer-generated Customer class There is nothing special in Listing 13-3 We merely instantiate a DataContext, which in this case is the designer-generated NorthwindDataContext We then create a new Customer object and insert it into the Customers Table<T> property Next, we call the SubmitChanges method to persist the new customer to the database Then, we query for that customer from the database and display it to the console just to prove the record was indeed inserted into the database table.

9/2/2007 6:02:16 PM Lonesome Pine Restaurant This output proves that the order record was indeed inserted into the database.

In Table 4-1, the open() and send() methods are the most common ones. The open("method", "URL"[, "asynch"[, "username"[, "password"]]]) method sets the stage for the request and upcoming operation. Two parameters are required; one is the HTTP method for the request (GET or POST), and the other is the URL for the connection. The optional asynch parameter defines the nature of this request true being the default and indicating that this is an asynchronous request. The other two optional parameters username and password allow application developers to provide a username and password, if needed. The send() method makes the request to the server and is called after you have set the stage with a call to the open() method. Any content passed to this method is sent as part of the request body.

The very last things we do are delete the customer by calling the DeleteOnSubmit method and persist to the database by calling the SubmitChanges method, so the database is left in the same state it was initially so that subsequent examples will run properly and so that this example can be run multiple times Let s examine the output of Listing 13-3: EXEC @RETURN_VALUE = [dbo].

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