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Note In the Visual Studio 2008 Beta 2 release and earlier, the DeleteOnSubmit method called in the preceding code was named Remove. You may find it odd that in Listing 14-1 I call the InsertOnSubmit method, but in Listing 14-2, I call the Add method. This discrepancy is caused by the fact that those methods are called on two different object types. In Listing 14-1, the InsertOnSubmit method is called on an object of type Table<T>. In Listing 14-2, the Add method is called on an object of type EntitySet<T>.

To have the designer generate the code necessary to call stored procedures or user-defined functions, drag the stored procedure or user-defined function from the Server Explorer to the Methods pane of the designer. We will demonstrate this in the next section.

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In 14, we will discuss overriding the insert, update, and delete methods used by LINQ to SQL when making changes to an entity class object. You can override the default methods by adding specific methods to an entity class. If you take this approach, be sure to use partial classes so you are not modifying any generated code. We will demonstrate how to do this in 14. However, overriding the insert, update, and delete methods is easily accomplished in the designer too. Let s assume you have a stored procedure named InsertCustomer that will insert a new customer record into the Northwind database s Customer table. Here is the stored procedure we will use:

In Listing 14-2, I created a Northwind DataContext, retrieved a customer, and added a newly constructed order entity object to the Orders EntitySet<Order> of the Customer entity object. I then queried for the new record and displayed it to the console.

CREATE PROCEDURE dbo.InsertCustomer ( @CustomerID nchar(5), @CompanyName nvarchar(40), @ContactName nvarchar(30), @ContactTitle nvarchar(30), @Address nvarchar(60), @City nvarchar(15), @Region nvarchar(15), @PostalCode nvarchar(10), @Country nvarchar(15), @Phone nvarchar(24),

Code Sample 4-2. Creating an Instance of the XMLHttpRequest Object Using ActiveXObject var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); It is also worth noting that the XMLHttpRequest object is not exclusive to standard HTML. The XMLHttpRequest object can potentially be used by any HTML/XML-based Web technology such as XUL or HTC.

Note Again, please notice that at the end of the example I am deleting, via the DeleteOnSubmit method, the order record added to the Orders table. If the example code does not complete, you will need to manually delete this record to maintain the state of the database for the subsequent examples.

nvarchar(24)

Since the Where method requires an input Enumerable to filter, and the method is static, that input Enumerable must be specified as an argument to the Where method. It would appear something like the following: static Enumerable Enumerable.Where(Enumerable input, LambdaExpression predicate) { } Ignoring for the moment the semantics of a lambda expression, calling the Where method would look something like the following: Enumerable enumerable = {"one", "two", "three"}; Enumerable filteredEnumerable = Enumerable.Where(enumerable, lambdaExpression); That doesn t look too ornery. But what happens when we need several where clauses Since the Enumerable that the Where method is operating on must be an argument to the method, the result is that chaining methods together requires embedding them inside each other. Three where clauses suddenly change the code to the following: Enumerable enumerable = {"one", "two", "three"}; Enumerable finalEnumerable = Enumerable.Where(Enumerable.Where(Enumerable.Where(enumerable, lX1), lX2), lX3); You have to read the statement from the inside out. That gets hard to read in a hurry. Can you imagine what a complex query would look like If only there was a better way.

INSERT INTO Customers ( CustomerID, CompanyName, ContactName, ContactTitle, Address, City, Region, PostalCode, Country, Phone, Fax ) VALUES ( @CustomerID, @CompanyName, @ContactName, @ContactTitle, @Address, @City, @Region, @PostalCode, @Country, @Phone, @Fax )

An XMLHttpRequest object instance provides methods that can be used to asynchronously communicate with the Web server (see Table 4-1).

N ote The InsertCustomer stored procedure is not part of the extended Northwind database. We manually added it for this demonstration.

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