Figure 4-15. Selecting the type of objects to add in visual

Insert Data Matrix barcode in visual Figure 4-15. Selecting the type of objects to add

The Panel control is a container to hold other controls or content. It is useful when the desired effect is to hide the content and then make it visible again.
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One-way calls are a little different from asynchronous calls in the respect that the .NET Framework does not guarantee their execution. In addition, the methods used in this kind of call cannot have return values or out parameters. You can also use delegates to call one-way methods asynchronously, but the EndInvoke() function will exit immediately without checking whether the server has finished processing yet. No exceptions are thrown, even if the remote server is
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As you know, in classic C++ you can define type conversion operators to enable automatic conversions between your type and another type. You can do this in managed types as well as in C++/CLI. The additional option you have in C++/CLI is to specify whether the conversion requires an explicit cast, or not. You do this with the explicit keyword. While the explicit keyword is also used in classic C++, in classic C++ it is used only on constructors, to prevent the constructor from being used to define an implicit conversion. In C++/CLI, the situation is different. Constructors for managed types are never used for implicit conversions, whether or not the explicit keyword is used on them, so using the keyword would be redundant. However, the keyword is used on conversion operators. Without the keyword, the conversion operator is assumed to be implicit, as it is in classic C++. With the keyword, the conversion operator is only invoked with an explicit cast (see Listing 7-23). Listing 7-23. Using explicit with a Conversion Operator // explicit_conversion.cpp using namespace System; value class BigIntExplicit { __int64 m_i;
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4. Double-click the form and add an Imports statement to Form1.cs for the System.Data.SqlClient namespace. 5. Insert the code in Listing 9-1 into the Form1_Load method.
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The purpose of operator overloading is to implement types that behave like built-in types. The basic rules for operator precedence and evaluation remain the same regardless of whether the operators are used with primitive types (int, double, etc.) or user-defined types, so if you wanted to define a new operator with its own precedence rules such as an exponentiation operator you couldn t do it. Unfortunately, C++/CLI adds to the long list of highly sophisticated languages that suffer from the omission of the exponentiation operator, so until some enlightened language designer chooses to change that, we have to concede to the FORTRAN fans that theirs is, after all, the language designed better for the expression of mathematical formulas. I m sorry, but the pow function is as poor an alternative as the add function would be for the + operator. I can only conclude that it s obvious that there is a cultural gap between computer language designers and computational scientists. OK, I ll get off my soap box now. However, despite these limitations, operator overloading is useful for many situations.
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There s usually more than one way to accomplish something in VBE, so instead of modifying the ComplexBinding project, we ll create a similar but more powerful project in a slightly different way to expand our techniques for developing Windows database applications. 1. Add a Windows Application project named GridUpdate to the 09 solution. Make the project the startup project. (Yes, now, not later.) 2. Change the Text property of Form1 to Customer Maintenance. 3. On the VBE menu, click Data Add New Data Source . You see the same window as in Figure 9-5, in the section Try It Out: Using Complex Data Binding. Follow the same steps you did there to create a data source for the whole Customers table. Note that when you eventually click Finish, the data source will be created, but unlike Figure 9-11, nothing will change on your form, and no tray will appear at the bottom of the screen. However, look in Solution Explorer and you ll find northwndDataSet.xsd has been added to the GridUpdate project (see Figure 9-16).
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While active-passive topology traffic reroutes data using the failover daemon (failoverd), in an active-active topology, traffic must be routed between multiple servers on a constant basis. There are two methods predominantly used for doing this. The first is using round-robin DNS. Round-robin DNS controls the order in which a load-balanced service forwards traffic across multiple servers. The administrator fills the domain records with multiple address records using the same host name but points to one or more IP addresses that serve the same service. As the DNS request is looking for your DNS server, the web server responds to the client with the next address from the list. The most basic round-robin DNS setup shapes traffic based on the assumption that each server can handle the same load, which is considered an equal cost path. A typical list of A record addresses in your zone file might look like the following if you have three servers:
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when it is released), the advanced editing controls are available all the time. A smart, new, dynamic interface allows you to collapse these controls out of sight when you don t need them.
A completely different no-go scenario for remoting is the necessity for distributed transactions, fine-grained security requirements, configurable process isolation, publish-and-subscribe events, and so on. Yes, you could in fact develop your own channel sinks and plug them into the .NET Remoting framework to enable these features. But why would you want to do so Why should you spend your time on these features instead of implementing your application s business requirements There already is another framework in .NET that includes all these features: Enterprise Services. If your application can make use of any of the following services, you should really think about using Enterprise Services instead of .NET Remoting: Distributed declarative transactions Highly flexible, configurable means of authentication and authorization Role-based security with roles independent of Windows user accounts Just-in-time activation of objects Object pooling Process isolation Server-side components as Windows Services Automatic queuing of component interactions with MSMQ In addition, COM+ 1.5, as it is available with Windows Server 2003, provides the added benefit of so-called Services Without Components (SWC). This allows you to use most of the services of the Enterprise Services framework without the necessity to derive your component from System.EnterpriseServices.ServicedComponents and without having to register your components in the COM+ catalog. To learn more about Enterprise Services and COM+, I d like to point you to Juval L wy s book, COM and .NET Component Services (O Reilly, 2001).
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Listing 11-17. XML File That Supplies Data to the XML Control < xml version="1.0" encoding="utf-8" > < xml-stylesheet type="text/xsl" href="Employees4.xslt" > <!-- This is list of employees --> <employees> <employee employeeid="1"> <firstname>Nancy</firstname> <lastname>Davolio</lastname> <homephone>(206) 555-9857</homephone> <notes> <![CDATA[includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International.]]> </notes> </employee> <employee employeeid="2"> <firstname>Andrew</firstname> <lastname>Fuller</lastname> <homephone>(206) 555-9482</homephone> <notes> <![CDATA[Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981. He is fluent in French and Italian and reads German. He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993. Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.]]> </notes> </employee> <employee employeeid="3"> <firstname>Janet</firstname> <lastname>Leverling</lastname> <homephone>(206) 555-3412</homephone> <notes> <![CDATA[Janet has a BS degree in chemistry from Boston College (1984). She has also completed a certificate program in food retailing management. Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.]]> </notes> </employee> </employees>
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