Building an asynchronous FTP client class in C#

While it's a relatively old technology, the File Transfer Protocol (FTP) is still a viable and useful communication method for moving data across a network. This in-depth article explains how an FTP server works and how it can be implemented using the Systems.Net.Sockets namespace included in the Microsoft .NET Framework and the C# programming language. The download includes the complete source code and a sample executable that you can use as a model when creating your own FTP solution.