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The WSE router serves as an intermediary between the outside world and your Web services. It is used to direct requests to the appropriate server and confirm that the requester is valid. Imagine a security guard who protects a building. The security guard stands at the door and checks the credentials of any people trying to enter the building. Once it is determined that the person is allowed to enter, the security guard might also act as a guide and direct the person to the right office within that building. A WSE router acts as a security guard for your Web services. It represents a gate between your Web services and the outside world. Your Web services can reside on a private network and be inaccessible to external clients. Any clients that want to use your Web services access the WSE router, which is also a Web service. Once validated, the clients are directed to the destination Web service on the private network. One of the benefits to using a WSE router is the ability to hide the details about your Web service. You can assign a virtual name to the router and the clients use this name instead of the server name on which the actual Web service resides. The client is unaware of your network s topology. The biggest benefit to using a WSE router, how ever, is the ability to perform maintenance on servers hosting Web services without experiencing any downtime. When maintenance needs to be performed, a change is made to the configuration that routes all requests to an alternative server until the original becomes available again.

2

ON HumanResources.Employee.BusinessEntityID = Person.Person.BusinessEntityID JOIN HumanResources.EmployeeDepartmentHistory ON HumanResources.Employee.BusinessEntityID = HumanResources.EmployeeDepartmentHistory.BusinessEntityID JOIN HumanResources.Department ON HumanResources.Department.DepartmentID = HumanResources.EmployeeDepartmentHistory.DepartmentID WHERE HumanResources.EmployeeDepartmentHistory.EndDate IS NULL ORDER BY Department, Division

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Sara Morgan A fellow developer recently shared an experience he had working with a WSE router. He was doing consulting work for a large financial firm that hosted sev eral Web services. External clients used the Web services to access financial ser vices through handheld devices. The company decided to implement a WSE router so that they could routinely take servers down for maintenance while still providing 24/7 access to the Web services. The company made many considerations regarding security, but they failed to consider performance. The extra layer of the WSE router immediately caused a performance reduction and angered many of their customers. At periods of high demand, the servers were so overwhelmed that most customers just gave up try ing to get what they needed. Eventually, the company was able to recover, but this is just one example of how important it is to consider performance before implementing a WSE router.

Over time, existing data in the database changes and requires modification. The UPDATE command allows you to change the value of one or more columns in one or more rows of a table. Adding a value to a column that is currently NULL and removing a value from a column are both considered UPDATE statements, not INSERT or DELETE statements. It is important to remember that an INSERT statement adds an entirely new row to the table and that a DELETE statement removes a complete row from the table.

A WSE router application is actually just a Web service. The sole job of this Web service is to route requests for other Web services. To create a WSE router, you need to create a project using the Web service template in Visual Studio 2005. Figure 11-5 shows the New Web Site dialog box that is displayed when selecting this type of project.

The text shown in the MaskedTextBox is not necessarily the text that is available to the user when cutting and pasting or to the application when text is manipulated program matically. The CutCopyMaskFormat determines how the text in the MaskedTextBox is treated when it is cut or copied by the user. The default value for this property is IncludeLiterals, in which case, literals from the Mask are included when text is cut or copied, but prompt characters are not. You can also set this property to ExcludePromptAndLiterals, which excludes both literals and prompts; IncludePrompt, which includes prompt characters but excludes literals; and IncludePromptAndLiter als, which includes both prompts and literals. The TextMaskFormat property has the same possible values and functions in the same way with respect to the text returned by the Text property.

Figure 11-5 Use the New Web Site dialog box to create a new ASP.NET Web service project, which is the basis for your WSE router

The UPDATE statement full syntax is as follows:

The latest version of WSE available is version 3.0. Refer to the Introduction for instructions on how to download and install this service pack add-on.

1. How can you create a TextBox with more than one line 2. What is the purpose of the MaskedTextBox

After the new project has been created, you need to add references to the following two .NET Framework components:

[ WITH <common_table_expression> [...n] ] UPDATE [ TOP ( expression ) [ PERCENT ] ]

This namespace contains the base classes needed to access WSE 3.0, which is needed to create a WSE router application.

1. You can create a multiline TextBox by setting the MultiLine property to True. 2. The MaskedTextBox control is used to display a format to the user for data entry or display, and to validate that data is input in the correct format.

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