C SHARP with a series of chat software, you can refer to, but also good.

C#做的网络聊天软件
..................\网络聊天软件
..................\............\ChatClient
..................\............\..........\AssemblyInfo.cs
..................\............\..........\Backup
..................\............\..........\......\AssemblyInfo.cs
..................\............\..........\......\ChatClient.cs
..................\............\..........\......\ChatClient.csproj
..................\............\..........\......\ChatClient.csproj.user
..................\............\..........\......\ChatClient.resx
..................\............\..........\......\ChatClient.sln
..................\............\..........\......\licenses.licx
..................\............\..........\bin
..................\............\..........\...\Debug
..................\............\..........\...\.....\ChatClient.exe
..................\............\..........\...\.....\ChatClient.pdb
..................\............\..........\...\.....\ChatClient.vshost.exe
..................\............\..........\...\.....\logs
..................\............\..........\...\.....\....\0204060802.txt
..................\............\..........\...\.....\....\0804061654.txt
..................\............\..........\...\.....\....\0804061655.txt
..................\............\..........\...\.....\....\0804061730.txt
..................\............\..........\...\.....\....\0804062327.txt
..................\............\..........\...\.....\....\0804062336.txt
..................\............\..........\...\.....\....\1501020010.txt
..................\............\..........\...\.....\....\1501020012.txt
..................\............\..........\...\.....\....\1501020148.txt
..................\............\..........\...\.....\....\2901041214.txt
..................\............\..........\ChatClient.cs
..................\............\..........\ChatClient.csproj
..................\............\..........\ChatClient.csproj.user
..................\............\..........\ChatClient.resx
..................\............\..........\ChatClient.sln
..................\............\..........\licenses.licx
..................\............\..........\obj
..................\............\..........\...\ChatClient.csproj.FileList.txt
..................\............\..........\...\Debug
..................\............\..........\...\.....\ChatClient.ChatClientForm.resources
..................\............\..........\...\.....\ChatClient.csproj.GenerateResource.Cache
..................\............\..........\...\.....\ChatClient.exe
..................\............\..........\...\.....\ChatClient.exe.incr
..................\............\..........\...\.....\ChatClient.pdb
..................\............\..........\...\.....\temp
..................\............\..........\...\.....\TempPE
..................\............\..........\UpgradeLog.XML
..................\............\..........\_UpgradeReport_Files
..................\............\..........\....................\UpgradeReport.css
..................\............\..........\....................\UpgradeReport.xslt
..................\............\..........\....................\UpgradeReport_Minus.gif
..................\............\..........\....................\UpgradeReport_Plus.gif
..................\............\..........\复件 ChatClient.cs
..................\............\ChatClient.exe
..................\............\ChatServer
..................\............\..........\AssemblyInfo.cs
..................\............\..........\Backup
..................\............\..........\......\AssemblyInfo.cs
..................\............\..........\......\ChatServer.csproj
..................\............\..........\......\ChatServer.csproj.user
..................\............\..........\......\ChatServer.sln
..................\............\..........\......\ChatServerForm.cs
..................\............\..........\......\ChatServerForm.resx
..................\............\..........\......\Client.cs
..................\............\..........\......\licenses.licx
..................\......

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