MCAD/MCSD Training Guide (70-320): Developing XML Web Services and Server Components with Visual C#™ .NET and the Microsoft .NET Framework

Introduction

As you saw in Chapter 4, “Basic Web Services,” Visual Studio .NET makes it very easy to create and consume Web services. Whether you use the wsdl.exe tool explicitly, or use a Web reference to call it implicitly, your client applications can use WSDL to create fully-functional proxy classes that tie them seamlessly to Web services servers. But you may find situations in which this automatic connection isn't quite flexible enough to do everything that you want. In this chapter, you'll learn about three advanced Web service techniques:

• SOAP extensions

• Asynchronous calls

• Custom wire formatting

Each of these techniques has its own set of applications. SOAP extensions enable you to modify the SOAP messages between client and server by inserting ...