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Creating and Comparing Hash Values for Object Instances The example Create and Compare Hash Values for Data Items uses the MD5Cng hash algorithm provider to create a hash of two instances of the Product class defined within the example project, demonstrating how different property values produce a different hash value. It then compares the second object instance with the hash of the first to show that they are different. The code shown below starts by creating an instance of the Product class, and then serializes it using the ToBytes method of the SerializationUtility class. Then it calls the CreateHash method of the Cryptography Manager, passing to it the name of the MD5Cng hash algorithm provider defined in the configuration of the application, and the byte array generated from the Product class instance. Next, the code repeats the process with another new instance of the Product class, with different values for its properties, and displays the hash of this to show that it is different from the other instance of the Product class created previously. Finally, the code compares the hash of the first instance of the Product class with the second instance of the same class to prove that they are not equivalent.

A big advantage of working at a company with so many programmers is the number of software tools written by employees that are available to help solve any problem you might be facing. A big disadvantage of working at a company with so many programmers is the number of software tools written by employees that you have to sort through to solve the problem you might be facing. Microsoft's internal portal for engineering and productivity tools has been a tremendous asset for many years, and the number of tools available has grown substantially every year. One drawback to the growth has been the number of disparate tools that solve a single problem, albeit all in slightly different manners. Searches on the portal for "test harness" and "test framework" return 25 and 51 results, respectively. Although many of these tools have unique features or purposes, there is a considerable amount of duplication in functionality.

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// package and import statements omitted public class EventLoader2 { public static void main(String[] args) { // Event and Location population code omitted Session session = null; Transaction tx = null;

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Define the service contract. Implement (or write) the service contract. Configure a service endpoint or endpoints. Host the service in an application. Reference and call the service from a client application.

Sample of Visual Basic Code Function Details(ByVal id As String) As ActionResult Dim nw As New northwndEntities() Dim custQuery = From c In nw.Customers Where c.CustomerID = id Select c Dim cust As Customer = custQuery.FirstOrDefault() Return View(cust) End Function Sample of C# Code public ActionResult Details(string id) { northwndEntities nw = new northwndEntities(); var custQuery = from c in nw.Customers where c.CustomerID == id select c; Customer cust = custQuery.FirstOrDefault(); return View(cust); }

Start Visual Studio and select the File New Web Site menu command. The New Web Site form appears (see Figure 23-1). Unlike desktop applications, you must immediately tell Visual Studio where you are going to store the files. We ll choose a location on the local filesystem, but this form also lets you work on a remote web site via FTP or HTTP. Choose the ASP.NET Web Site template, enter a directory path where you want to store the files, and click the OK button. Figure 23-2 shows Visual Studio ready to start your new web application (the toolbars displayed are per my preferences). The Solution Explorer panel already shows three files and a folder included in the project. If you browse to the project s directory the default location in Windows Vista is C:\Users\username\Documents\Visual Studio 2008\WebSites\WebSite1 you ll see these same files. The web.config file is an XML file that contains application-specific settings; it s related to the app.config file used in desktop applications. Default.aspx is the web page itself, which will contain a mixture of HTML and special ASP.NET tags and directives. The related Default.aspx.vb file contains the Visual Basic code behind source code that will eventually be compiled to a DLL.

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