server and the client must have a communications socket, but the server should first enter the state eavesdropping, and then sent the client socket connection request, the server received a request to establish another socket communication, the original charge of eavesdropping socket still eavesdropping.

异步套接字监听
..............\ClientSocketListener2

..............\.....................\AssemblyInfo.cs
..............\.....................\bin
..............\.....................\...\Debug
..............\.....................\ClientSocketListener2.csproj
..............\.....................\ClientSocketListener2.csproj.user
..............\.....................\ClientSocketListener2.sln
..............\.....................\Form1.cs
..............\.....................\Form1.resx
..............\.....................\obj
..............\.....................\...\Debug
..............\.....................\StateObject.cs
..............\ServerSocketListener2

..............\.....................\AssemblyInfo.cs
..............\.....................\bin
..............\.....................\...\Debug
..............\.....................\Class1.cs
..............\.....................\Form1.cs
..............\.....................\Form1.resx
..............\.....................\obj
..............\.....................\...\Debug
..............\.....................\ServerSocketListener2.csproj
..............\.....................\ServerSocketListener2.csproj.user
..............\.....................\ServerSocketListener2.sln

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