Question

I am trying to replce the follwing code that works fine

TcpClient oC = new TcpClient(ip, port); oC = new TcpClient(ip, port); StreamReader messageReader;  try {    messageReader = new StreamReader(oC.GetStream(), Encoding.ASCII);    reply = messageReader.ReadLine(); } 

with

try {    using (messageReader = new StreamReader(oC.GetStream(), Encoding.ASCII))    {        reply = messageReader.ReadLine();    } } 

But I get an InvalidOperationException saying

The operation is not allowed on non-connected sockets.

What is the problem and how can I fix it?

More: I have oc.Connect before this code, so I am connected and when It wants to be used for the first time is works fine, it is only after that that I get that Exception, I played around a bit with it and now I get:

Cannot access a disposed object.\r\nObject name: ‘System.Net.Sockets.Socket’.

Answer 1

Just reiterating my comment on Jareds answer.

Ali Commented:

I have oc.Connect before this and it works fine for the 1st time, but the 2nd time it happens, I also get ‘Cannot access a disposed object.\r\nObject name: ‘System.Net.Sockets.Socket’.’ – Ali (13 mins ago)

I Commented:

‘and that’s because StreamReader takes ownership of the stream, and closes and disposes the Stream you initiate it with. In this instance, the NetworkStream of the TcpClient. Theres no need to dispose of the StreamReader here’