Chapter 11:

XML Web Services and the Network

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What do we have in this chapter?

1. Web Services

Interacting with the Network

Web Services and HTTP

Extending Your Service

Controlling the HTTP Request-Response Pair

C# Code Snippet

Visual Basic .NET Code Snippet

C++ Code Snippet

2. Creating and Consuming the ASP .NET Web Service and C# Program Example

The ASP .NET Web Service Application

Running and Testing the Web Service Application

The C# Console Application

Setting-up the IIS Web Server

3. Adding the Web Service Reference (proxy class)

4. Creating and Consuming the Web Service ASP .NET and VB .NET Program Example

Creating the VB .NET Console Application

Adding the ASP .NET Web Service Application

Building and Running the Web Service Application

Testing the Web Service Application

Adding the Web Service Reference

Build, Run and Test the Whole Project

5. Consuming the ASP .NET/C# Web Service Application: C++ Program Example

Creating the C++ CLR Console Application

Adding the ASP .NET/C# Web Service Reference

Build, Run and Test the Whole Project

6. Performance

100 Continue and POST

Pre-authentication

Connection Pooling

Nagle Algorithm

Scalability

Calling a Web Service from Within ASP.NET

C#/ASP .NET Asynchronous Web Service Access Program Example

Creating C# ASP .NET Web Service Application

Build, Run and Test the Web Service Application

7. Configuring IIS for Web Service Hosting

8. The ASP .NET Debugging Options in IIS

Adding New C# Asynchronous Class Library Project

Adding the System.Web Reference Manually

9. The Proxy Class BeginXXX and EndXXX Issue

Adding the Web Service Reference to the Existing C# Project

10. Completing the C# Asynchronous Class Library Project

Build and Run the Whole Project

Loading the DLL for the Web Service Application

The DLL and the bin Folder

11. IIS Web Log

ASP .NET Configuration

ASP .NET Temporary Files

12. VB .NET/ASP .NET Asynchronous Web Service Program Example

Creating the ASP .NET/VB .NET code Web Service

Build and Run the Web Service Project

ASP .NET Development Server

Testing the Exposed Web Service Methods

13. Adding New VB .NET Module

14. Resolving .NET System.Web Namespace Manually

The BeginXXX and EndXXX Proxy Class Issue

Adding Web Service Reference

15. Editing the Web.config File

The DLL Module and bin Folder

Running the Whole Project

The ASP .NET Development Server Configuration

Load Balancing Back-End Web Service Calls

Avoiding Common Pitfalls

Consuming an External Web Service

Using Certificates from the Middle Tier

Handling Network Failures

Transferring Large Amounts of Data

The Future: WCF

Summary

In this chapter, we looked at how Web services in the .NET Framework interact with the network. We discussed the ways in which Web services bind to the HTTP protocol, and we outlined mechanisms available for extending the service and customizing the underlying protocol. Next, we went through network performance, scalability, and load balancing scenarios for Web services. Finally, we covered the most common network-related pitfalls that occur when developing Web services and recommended tips on how to best deal with them.

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