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In addition, you might be developing a component that is expected to be called through a Web service. If your component is expected to be exposed as a Web service, it s important that your interface be as atomic and stateless as possible. A Web service is more than just another transport layer; it is a disconnected transport. In general, the best practice for using Web services in your components is to make the interface to the component message-based. In other words, a single operation should be able to take a payload that allows as much of the job as possible to be done in a single call. Trying to expose an object across Web services can be a nightmare if you try and have a stateful, chatty component. You must also consider that, since you are writing components for a Windows Forms application, your component might take the form of a control or design-time component. When you consider who will consume your component, you should try and create components that are easily consumed. This means you might need to create wrappers for special needs or, in the case of creating controls and Web parts, you will likely need to create design-time features like preview of the control s ultimate UI output.

Keep in mind that although an end user calls to report that all of the e-mail messages are missing, they might not be. Consider these errors in user logic:

Location Computer Configuration\Administrative Templates\Network Computer Configuration\Administrative Templates\Network Name Background Intelligent Transfer Service (BITS) inactive job timeout Sets how often a DFS Client discovers DC's Key HKLM\Software\Policies\Microsoft\Windows\BITS\JobInactivityTimeout

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Create policy elements, access rules, and connection limits. Policy elements include schedule, protocols, user groups, and network objects.

Practice: Planning a Server Consolidation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

When we create a skeleton of the code, it might look something like this:

ServiceWse DemoService = new ServiceWse();

CONFIGURATION FILE < xml version="1.0" encoding="utf-8" > <configuration> <system.runtime.remoting> <application> <channels> <channel ref="tcp" /> </channels>

D. Incorrect: Password policies apply domain-wide. Password policies applied at the local level do not override the password policies set at the domain level. If you take this set of steps, the password policies will remain as they did before at the domain level.

SQL Server 2008 provides a large number of built-in functions in a variety of categories. You can use many of these functions to enhance your queries. You also can use many of these functions to perform actions such as inserting data, creating tables, and creating constraints, as discussed later in this book.

The installation of an ISA Server array in a workgroup, where the Configuration Storage server is a member of a domain but the ISA Server computers are not. In this scenario, you can deploy multiple Configuration Storage servers and implement certificate authentication between the Configuration Storage servers and the ISA Server computers. The installation of both the Configuration Storage server and the ISA Server computers in a workgroup, creating an isolated enterprise. In this scenario, you can only deploy a single Configuration Storage server for the enterprise, and will need to implement certificate authentication between the Configuration Storage servers and the ISA Server computers. A mixed installation of multiple ISA Server computer arrays, where the Configuration Storage server is a member of a domain, and some of the ISA Server computers are also domain members, but some ISA Server computers are not. In this scenario, you can create one or more arrays that include ISA Server computers that

' VB Private Function TraceMessage(buffer As MessageBuffer) As Message Dim msg as Message = buffer.CreateMessage() System.Diagnostics.Trace.WriteLine("Message contents" & _ msg.ToString()) Return buffer.CreateMessage() End Function // C# private Message TraceMessage(MessageBuffer buffer) { Message msg = buffer.CreateMessage(); System.Diagnostics.Trace.WriteLine("Message contents" + msg.ToString()); return buffer.CreateMessage(); }

In the query window, add a constraint that verifies that the Name column in the Test.Customers table must start with a letter and be at least three characters long. The correct statement follows but don t look at it before you have tried to create the constraint yourself. Type, highlight, and execute the following statement:

Table 2-6