Using extern to declare class objects

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C++

Hi friends...
I am declaring object of a class in one cpp file and calling functions using that object. Now I want to use same object in another cpp file. I am trying to declare that object in another file using extern, but linker gives me an error that object is already defined.

First cpp file:

CClientSock client;
lv_status = client.startup();
if (lv_status != 0)
{
    MessageBox("Connection Failed");
    exit(1);
}

Second cpp file:

extern CClientSock client;
client.connectSocket();

Please suggest the solution. Kindly let me know if more info is required. Thank you!