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sockets in basic chat application creating trouble

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I am new to the topic of sockets & testing the waters with a basic chat application (on dos), i intend to work my way upto a full fledged GUI chat application. The code for server & client works fine as long as either one is writing & the other is reading but as soon as my code tries to read from server (on client) & client writes back, the code does nothing & an exception of connection reset is shown.



In a previous version of the above code i was using a boolean value to check the condition in an if statement for reading or writing & the value of the flag was reversed in server as well as client i.e., when server was writing client would read & vice versa. But, the error still remained the same.
I think threads are an obvious possibility but there isn't the need of the same in this code since I don't want to handle multiple sessions at this point of time.
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Using += on a String repeatedly is very inefficient. Use a StringBuilder instead.
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