C# Cookbook, 2nd Edition

Problem: You need to create a server that listens on a port for incoming requests from a TCP client. These client requests can then be processed at the server, and any responses can be sent back to the client. Recipe 16.2 shows how to write a TCP cl...

Problem: You want to interact with a TCP-based server. Solution: Use the MyTcpClient class shown in Example 16-2 to connect to and converse with a TCP-based server by passing the address and port of the server to talk to, using the System.Net....

Problem: You need to send a collection of name-value pairs to simulate a form being executed on a browser to a location identified by a URL. Solution: Use the System.Net.WebClient class to send a set of name-value pairs to the web server using...

Problem: You need to download data from a location specified by a URL; this data can be either an array of bytes or a file. Solution: Use the WebClient.DownloadData method to download data from a URL: string uri = "http://localhost/mysite/...

Problem: You need a way to use named pipes to communicate with another application across the network. Solution: Create a P/Invoke wrapper class for the named-pipe APIs in Kernel32.dll. You can then create a managed client and managed server c...

Problem: You want to check a computer's availability on the network. Solution: Use the System.Net.NetworkInformation.Ping class to determine if a machine is available. In the TestPing method, an instance of the Ping class is created. A ping re...

Problem: You want to be able to send email via SMTP from your program, but you don't want to learn the SMTP protocol and hand-code a class to implement it. Solution: Use the System.Net.Mail namespace, which contains classes to take care of the...

Problem: You need to determine the characteristics of the network adapters currently on the machine. Solution: Use the DisplayNICInfo method shown in Example 16-9 to display all of the characteristics of the currently existing network adapters...

Problem: You want to determine the open ports on a machine to see where the security risks are. Solution: Use the CheapoPortScanner class constructed for your use; its code is shown in Example 16-11. CheapoPortScanner uses the Socket class to ...

Problem: Your program wants to use the current Internet connection settings without forcing the user to add them to your application manually. Solution: Read the current Internet connectivity settings with the InternetSettingsReader class prov...

Problem: You want to programmatically download files using the File Transfer Protocol (FTP). Solution: Use the System.Net.FtpWebRequest class to download the files. FtpWebRequests are created from the WebRequest class Create method by specifyi...