Vista - TCP Client problem

Dear all,

I need to use a TCPClient to continue posting information to the server. I
have problems that

1) when you server is not available, the TCPClient.Connect(ip, port) raise
error but it consume certain memory for every .Connect() failure. If the
server keeps unavailable for a long time, my program uses a huge size of
memory.

2) even the server is back on, the .Connect() still reporting error Until I
create a new instant, 'myClient = new TCPClient()' then the .Connect()
success. Why?

Can anyone tell me how to solve the problems?

Thanks for any help!

Tedmond