about virtual classroom namespace

sir In this project I have doubt about 'using virtualclassroom' namespace<div>can you please tell me about that namespace?? because if try to execute the application</div><div>I am getting namespace error.....&nbsp;<span style="background-color: transparent;">do I need to add any reference files for&nbsp;</span></div><div>that if so where I can get those reference files... please help</div><div>me its very urgent.. also tell me about the database connections also</div><div>please sir I am waiting for your reply....</div>

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