The technology of modern society refresh ceaselessly, in order to meet people’s need of communication, we exploder a new software, its name is “the software of communication in the LAN”. It is specially to communicate with others in the LAN. Its functions are: network settings, message sending, notice sending, network meetings, and document sending.
C# is a new language of the Microsoft that base on the visual studio .NET. It has good security Just because of the specialty of C# and DOTNET, we choose it to exploder the software. This software adopts the UDP protocol, and so on, its functions can execute at the same time. Also, it economize the special server, the server’s function was embed into the software, it made itself not only can be seen as the server, but also can be seen as the client. Therefore, we have no need to land on the serve, it do good to protecting the message.
Keywords: LAN communication , C#, Visual Studio.NET ，UDP protocol
