Asynchronous sockets, looking for explanation

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.NET4

sockets

Hi, I am planning to create an asynchronous sockets client-server architecture, however I have some questions to ask so it can clarify some things for me. I have build multiples REST architecture in the past but its my first time with sockets.

So lets say for example that I would like to create a simple chat, I understand that the server keep a sockets collections of all the connected clients and upon the reception of a message I'll just loop throught that collections to broadcast send the messages to all client.

Now, lets say that I also have support for file transfer and that the server is transfering a very big file to a client, what will happen if a chat message is broadcasted during this time and the file transfer is not completed? Will the client receive the message even if he is already communicating with the server to transfer a file? How should I deal with this if its not the case?

Thanks in advance!