This is written in C# udp hole program. The basic principle to achieve a hole. Hope to use a.

客户端\ClassLibrary1\bin\Debug\ClassLibrary1.dll
......\.............\...\.....\ClassLibrary1.pdb
......\.............\Class1.cs
......\.............\ClassLibrary1.csproj
......\.............\obj\ClassLibrary1.csproj.FileList.txt
......\.............\...\Debug\ClassLibrary1.dll
......\.............\...\.....\ClassLibrary1.pdb
......\.............\Properties\AssemblyInfo.cs
......\WindowsApplication2\bin\Debug\ClassLibrary1.dll
......\...................\...\.....\ClassLibrary1.pdb
......\...................\...\.....\WindowsApplication2.exe
......\...................\...\.....\WindowsApplication2.pdb
......\...................\...\.....\WindowsApplication2.vshost.exe
......\...................\Client.cs
......\...................\Form1.cs
......\...................\Form1.Designer.cs
......\...................\Form1.resx
......\...................\obj\Debug\ResolveAssemblyReference.cache
......\...................\...\.....\WindowsApplication2.csproj.GenerateResource.Cache
......\...................\...\.....\WindowsApplication2.exe
......\...................\...\.....\WindowsApplication2.Form1.resources
......\...................\...\.....\WindowsApplication2.pdb
......\...................\...\.....\WindowsApplication2.Properties.Resources.resources
......\...................\...\WindowsApplication2.csproj.FileList.txt
......\...................\Program.cs
......\...................\...perties\AssemblyInfo.cs
......\...................\..........\Resources.Designer.cs
......\...................\..........\Resources.resx
......\...................\..........\Settings.Designer.cs
......\...................\..........\Settings.settings
......\...................\WindowsApplication2.csproj
......\WindowsApplication2.sln
......\WindowsApplication2.suo
服务端\WindowsApplication1\bin\Debug\ClassLibrary1.dll
......\...................\...\.....\ClassLibrary1.pdb
......\...................\...\.....\WindowsApplication1.exe
......\...................\...\.....\WindowsApplication1.pdb
......\...................\...\.....\WindowsApplication1.vshost.exe
......\...................\Form1.cs
......\...................\Form1.Designer.cs
......\...................\Form1.resx
......\...................\obj\Debug\ResolveAssemblyReference.cache
......\...................\...\.....\WindowsApplication1.csproj.GenerateResource.Cache
......\...................\...\.....\WindowsApplication1.exe
......\...................\...\.....\WindowsApplication1.Form1.resources
......\...................\...\.....\WindowsApplication1.pdb
......\...................\...\.....\WindowsApplication1.Properties.Resources.resources
......\...................\...\WindowsApplication1.csproj.FileList.txt
......\...................\Program.cs
......\...................\...perties\AssemblyInfo.cs
......\...................\..........\Resources.Designer.cs
......\...................\..........\Resources.resx
......\...................\..........\Settings.Designer.cs
......\...................\..........\Settings.settings
......\...................\Server.cs
......\...................\WindowsApplication1.csproj
......\WindowsApplication1.sln
......\WindowsApplication1.suo
客户端\ClassLibrary1\obj\Debug\TempPE
......\WindowsApplication2\obj\Debug\TempPE
服务端\WindowsApplication1\obj\Debug\TempPE
客户端\ClassLibrary1\bin\Debug
......\.............\obj\Debug
......\WindowsApplication2\bin\Debug
......\...................\obj\Debug
服务端\WindowsApplication1\bin\Debug
......\...................\obj\Debug
客户端\ClassLibrary1\bin
......\.............\obj
......\.............\Properties
......\WindowsApplication2\bin
......\...................\obj
......\...................\Properties
服务端\WindowsApplication1\bin
......\...................\obj
......\...................\Properties
客户端\ClassLibrary1
......\WindowsApplication2
服务端\WindowsApplication1
客户端
服务端

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