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The first step in creating a native web service is to create stored procedures or functions that you want to make web callable. In our example, you need to create a stored procedure named GetEmployees that returns the EmployeeID, FirstName, and LastName columns of the Employees table. The complete script of the stored procedure is given in Listing 10-37. Listing 10-37. Creating the GetEmployees Stored Procedure CREATE PROCEDURE GetEmployees AS SELECT EmployeeID, FirstName, LastName FROM Employees

delta = -106 (see below)

So far, the weather application that you have created is sending as many requests for weather data as the user types in zip codes When the data comes back from the weather web service, the order that this data comes back in is not guaranteed For example, if the user first types in 32207 (Jacksonville) and then types in 10001 (New York City), the weather results for Jacksonville may come in behind New York City, yet the user would not realize that she s seeing Jacksonville s weather when New York s zip code still remains on the screen It would be great if there were a solution that gave an application the power to cancel out all weather requests that occurred prior to the latest one, ie.

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The dataset constructor is overloaded: Dim ds As DataSet=New DataSet Dim ds As DataSet=New DataSet("MyDataSet") If you use the parameterless constructor, the dataset name defaults to NewDataSet. If you need more than one dataset, it s good practice to use the other constructor and name it explicitly. However, you can always change the dataset name by setting its DataSetName property. You can populate a dataset in several ways, including the following: Using a data adapter Reading from an XML document In this chapter, we ll use data adapters. However, in the Using Datasets and XML section, you ll take a quick peek at the converse of the second method, and you ll write from a dataset to an XML document.

, in our example, a request for Jacksonville weather is canceled as soon as request for New York City weather is made RxNET provides such a solution There are two operators in RxNET TakeUntil() and Switch that allow for cancellation of operations that occur prior to the latest operation and are still in-flight so to speak, or are still pending the return values Through the use of an elegant LINQ query, these operators tie together Observable collections, as you will see shortly But first, there is some bad news: in the current implementation of NET framework on Windows Phone 7, it is impossible to link the beginning of the asynchronous web service invocation to the end of that invocation The root of the problem is the exclusion of the CreateChannel method implementation in the Windows Communication Foundation libraries on Windows Phone 7.

2. Since you now have two projects in your solution, you need to make this project the startup project so it runs when you press Ctrl+F5. Right-click the project name in Solution Explorer, and then click Set As StartUp Project. 3. Run the application by pressing Ctrl+F5. The results should appear as in Figure 4-7.

Microsoft had to slim down and optimize NET framework on the phone, and the loss of this method for the time being seems to be due to those optimization efforts Nevertheless, the technique for canceling in-flight requests still applies to the clients with fullNET framework installed (Windows Forms and WPF applications) and to the Silverlight platform For the weather application, we will demonstrate the technique of canceling those requests by creating a new Observable collection for the weather service each time a user types in a new zip code Note, however, that the Observable subscriptions that you will be creating listen for any completed weather service requests, and not the specific ones In other words, each one of these subscriptions would process both Jacksonville and New York City weather from the example, and the order that this weather data comes in would be irrelevant.

On Windows Phone 7, the Rx.Net implementation is contained within two separate assemblies Microsoft.Phone.Reactive and System.Observable. 3. Add a Reference to Microsoft.Phone.Reactive and System.Observable assemblies, by right-clicking and selecting Add Reference.

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