FTP客户端软件是在了解FTP工作原理后，利用C#语言来设计和开发的。FTP客户端分为连接模块、文件管理模块、文件传输模块和辅助管理模块。连接模块实现主机与服务器的连接的功能；文件管理模块实现新建文件、删除文件等功能；文件传输模块实现主机与服务器连接成功后上传和下载文件功能。辅助管理模块实现一些相关功能如：读写配置INI文件。该FTP客户端软件达到了使用方便的目标，希望开发软件的经验能为使用.NET设计开发Windows应用程序FTP客户端软件的初学者提供一些帮助。-FTP client FTP software is to understand the working principle, the use of C# language to design and development. FTP client to connect into the module, document management module, file transfer module and auxiliary management module. Connection module for connection to the host and server functions　document management module of the new files, delete files, etc.　file transfer module to achieve a successful connection with the server host to upload and download files function. Secondary management module to achieve a number of related functions such as: reading and writing configuration INI file. The FTP client software to achieve the goal of easy to use, hope the experience of developing software for use. NET Windows application design and development of FTP client software to provide some help for beginners.