通过网上收集的P2P文件传输及共享材料及源代码，包括即时通，NAT，文件分块，P2P传输等,Through the online collection of P2P file transfer and sharing of materials and source code, including instant messaging, NAT, file blocking, P2P transmission

c#+net+2.0+即时通讯源码服务端客户端+-CSharp net 2.0 source instant messaging client server