C#写的模拟QQ聊天软件，可以学习网络编程。当用户第一次运行客户端程序时，将会弹出注册窗口进行注册，用户注册后，再次运行客户端程序时，将直接进行登录，无须注册。用户首先启动服务器端，如图1.1所示。单击“控制台”/“开始服务”命令，启动服务器端的UDP协议。在局域网的其它计算机中，启动客户端程序，如果用户第一次运行本程序，将弹出用户注册窗口。
When a user first runs the client program, registration window will pop up to register, after user registration, when you run the client program again, it will log in directly without registration. The user first starts the server, as shown in Figure 1.1. Click Control Panel / Start service command to start the server UDP protocol. In the other computers in the LAN, start the client program, if the user first runs of the program, the user registration window will pop up. (2014-11-25, C#, 1407KB, 下载8次)
仿QQ企业聊天系统，主要通以UDP协议的通信方式，实现在线聊天，图片发送，视频连接的功能。其中有大量注释，非常适合初学者。通过学习源码，可以掌握UDP协议的通信方式，以及在UDP协议的Socket中，如何以文件分流的方式发送大图片，换还可以初步了解自定义控件的制作过程
Imitation QQ chat enterprise systems, mainly through the means of communication with the UDP protocol, online chat, send pictures and video connections. (2013-09-06, C#, 2024KB, 下载19次)
本代码包括C#的IM 即时通讯，企业即时通讯例子,有好友列表，聊天，群聊，p2p语音，P2P视频，P2P文件传输功能，并可与WebIM互通。本代码在PRTX即时通讯SDK开发包上开发。下载代码后，你们只需要花几天自己美观下界面即可，也可以参考本代码将即时通讯功能移植到其它比如Vb6，Delphi，PB等开发的软件中。
The code include the C# IM instant messaging, enterprise instant messaging examples, buddy list, chat, group chat, p2p voice, P2P video, P2P file transfer capabilities, and interoperability with WebIM. The code PRTX Instant Messaging SDK development kit development. Download code, you need to take a few days to own beautiful under the interface can be, the instant messaging feature ported to other software such as Vb6, Delphi, PB developed can also refer to the code.
(2012-12-07, C#, 20767KB, 下载52次)
即时通讯软件设计与实现
摘 要
网络通讯是目前计算机用户进行交流最普遍的方式，各种各样的聊天软件也层出不穷；服务提供商也提供了越来越丰富的通讯服务功能。当前中国的互联网技术已经进入了一个飞速发展的时期，即时通讯工具作为当今网络应用的主流，越来越受到了人们的青睐，使人们的网上生活更加丰富多彩。当今使用最为广泛的即时通信工具，比如腾讯公司的QQ聊天软件。
Instant messaging software designed computer users to exchange the most common way a variety of chat software are endless ISP provide increasingly rich communications services and to achieve a summary of network communication. China' s Internet technology has entered a period of rapid development of real-time communication tools as the mainstream of today' s network applications, more and more people of all ages to make online life more colorful. Today the most widely used instant messaging tools, such as Tencent QQ chat software. (2012-06-29, C#, 632KB, 下载13次)
根据企业对QQ系统的要求，本系统可以实现以下目标：
操作简单方便、界面简洁美观。
每个客户端只能注册一次。
可以在局域网中实现文字及大图片的传输。
可以实现局域网视频。
可以实现多用户的信息通信。
系统运行稳定、安全可靠。
QQ system based on business requirements, the system can achieve the following objectives:
simple operation, the interface simple and beautiful.
Each client can only be registered once.
can be implemented in the LAN transmission of text and large pictures.
LAN can video.
can achieve multi-user information and communication.
system is stable, safe and reliable. (2012-01-11, C#, 900KB, 下载9次)
MyQQ根据企业对QQ系统的要求，本系统可以实现以下目标：
操作简单方便、界面简洁美观。
每个客户端只能注册一次。
可以在局域网中实现文字及大图片的传输。
可以实现局域网视频。
可以实现多用户的信息通信。
系统运行稳定、安全可靠。
MyQQ according to the QQ system, the system can achieve the following goals:
The operation is simple and convenient, simple and beautiful interface.
The each client can only be registered once.
The can be achieved in the LAN text and picture transmission.
The can achieve LAN video.
The can realize multi user information communication.
The system is stable, safe and reliable.
(2011-08-17, C#, 896KB, 下载6次)
云骞开源IM（Lesktop 2.1.2.10）是一款使用ASP.NET，Ajax和Comet等技术开发的轻量级IM。主要功能特点如下：
1、云骞开源IM的服务端实际上就是一个ASP.NET网站，因此不需要使用独立服务器，仅需要一个支持.NET2.0的Web空间即可将IM部署到互联网上。
2、只需要拷贝两个文件夹，并在页面中嵌入一行代码，就可以将IM集成到自己的网站或企业内部的OA系统中。
数据库配置：
Lesktop默认使用SQLite数据库，您可以修改Lesktop/Web.config文件，使用SQL Server数据库，具体方法如下：
将Lesktop/Web.config中的AppSettings中的：
修改为：
配置好名称为Lesktop_ConnectString连接字符串。
Yun Qian open source IM (Lesktop 2.1.2.10) is a use of ASP.NET, Ajax, and Comet and other technology development lightweight IM. Main features are as follows: 1, Yun Qian of the open source IM server is actually an ASP.NET Web site, so do not need to use a separate server, only need a support. NET2.0 the Web space can be deployed to the Internet, IM . 2, only need to copy two folders, and a line of code embedded in the page, you can integrate IM into their website or business within the OA system. Database Configuration: Lesktop default SQLite database, you can modify the Lesktop/Web.config file, use the SQL Server database, and specific methods are as follows: The Lesktop/Web.config in the AppSettings: amended to read: configured connection string name is Lesktop_ConnectString string. (2011-04-14, C#, 4660KB, 下载16次)