C# - Network Programming - Verify client before allowing connection -

i'm new network programming stackoverflow, hope won't make bad mistakes.

i try code client/server application using tcplistener/tcpclient. don't want accept every client trying connect server.

i don't understand if 2 parties stay connected when client doesn't send request, , how possible verify client using password or something. how this?

i don't expect tutorial maybe link reference or youtube tutorial, couldn't find helpful things on research.

thank you, fre3zr

the tcp protocol works following: or accept connection or don't. after accepting, can checks , reject client, if want.

pseudo-code:

sock1.accept()  if data     store received data in "x"     if password match "x" continue, if not: kickclient() end if 

and yes, client keeps connected when finished sending data, must disconnect him in order free resources.

add code question, more.