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Editorial Team
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Editorial Team
Asked: May 19, 20262026-05-19T17:52:17+00:00 2026-05-19T17:52:17+00:00

I have a HashSet that is a collection of client sockets. When a client

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I have a HashSet that is a collection of client sockets. When a client connects, the socket is added to the HashSet. I then need to access that socket, but I don’t know how to access it in the HashSet.

... 
clientSockets.Add(listenerSocket.EndAccept(async));
WaitForData(lastAddedSocket);
....

How could I determine what lastAddedSocket is?

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  1. Editorial Team
    Editorial Team
    2026-05-19T17:52:18+00:00Added an answer on May 19, 2026 at 5:52 pm

    There is no way to ask a HashSet “what was the last thing that was added to you?” The order is all jumbled up.

    You should simply keep a separate variable called lastAddedSocket. Every time you add a socket to the HashSet, also assign it to lastAddedSocket. Then you will be able to look it up easily and in constant time.

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