Chapter 6

Introduction to System.Net

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What do we have in this chapter?

1. Introduction

Layers of System.Net

Basic Network Types and Services

Using IP Addresses

Working with Different Address Families

Accessing Protected Resources

Accessing DNS

2. C++ Services and Types Program Example

C# Services and Types Program Example

VB .NET Services and Types Program Example

3. Using the Socket-Level Classes

Socket Classes

Reading and Writing with NetworkStream

Using the Socket-Level Helper Classes

C++ Socket Program Example

4. C# Socket Program Example

VB .NET Socket Program Example

5. Application Protocols

Protocol Support

HTTP Connection Management

HTTP Error Handling

File Scheme Support

C++ HTTP Protocol Program Example

6. C# HTTP Protocol Program Example

VB .NET HTTP Protocol Program Example

7. Request-Response Model

Resolving URIs with WebRequest and WebResponse

Request-Response Model Helper Classes

Deciding When to Use System.Net

Common Scenarios for Using System.Net

Accessing an Existing Service or Protocol Provided by System.Net

Implementing a Protocol Not Provided by System.Net

Extending a Higher Layer of the Stack That Uses System.Net

System.Net vs. Web Services or .NET Remoting

C++ Request and Response Program Example

8. C# Request and Response Program Example

VB .NET Request and Response Program Example

C++ Request and Response Web Client Program Example

C# Request and Response Web Client Program Example

VB .NET Request and Response Web Client Program Example

Summary

This chapter will introduce the System.Net namespace. It will describe the purpose of the classes in System.Net and review its layers of functionality. We will review the basic types and services such as address manipulation and interaction with DNS. We will discuss the socket-level classes, including Socket, NetworkStream, and other helper classes. We then will walk through the HttpWebRequest and HttpWebResponse classes, which provide access to the HTTP protocol. Finally, we will review the request-response URI resolution pattern and its helpers.

This chapter also will cover recommendations on when to use System.Net versus the higher-level communication classes provided by Web services and .NET Remoting. Starting with these classes and their basic purpose, the next five chapters will describe the workings of these classes in much more detail.

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