How to test for a broken connection of TCPClient after being connected?

Question

I\'ve been fighting with one problem for a whole 3 days I can\'t find any solution, please help :)
I work with Visual Studio 2010 and C# language.

I have a devic

Answer 1

Just in case anyone else needs something simple and effective.

This is the code I came up with

            while (true)
            {

                string s = null;
                DateTime readLag = DateTime.Now;
                try
                {
                    s = streamIn.ReadLine();
                }
                catch (Exception ex)
                {
                    SocketException sockEx = ex.InnerException as SocketException;
                    if (sockEx != null)
                    {
                        OnDebug("(" + sockEx.NativeErrorCode + ") Exception = " + ex);
                    }
                    else
                    {
                        OnDebug("Not SockEx :" + ex);
                    }
                }



                if (enableLog) OnDebug(s);
                if (s == null || s == "")
                {
                    if (readLag.AddSeconds(.9) > DateTime.Now)
                    {
                        break;
                    }
                }
                else
                {
                    CommandParser(s);
                }
            }

What I got was native error 10035 every time a read failed but would block.

When the connection was trashed, I instantly got a return with no data.

Setting the readLag.AddSeconds() to just below my read timeout would give me a pretty good idea that the time never elapsed, and I got no data. Which should not happen.

Soon as this criteria popped up, I just kick out of the loop and the thread ends.

Hope this helps anyone else out there.