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PLS Socket MultiThreading

P: n/a
OS: Winxp and Win2003
Visual Basic.NET 2003
MS-SQL Server 2000

hey all

I am a newbie in but i have managed to build a simple chat server
in using socket and a client connecting to it made in vb6. Some
of the code in the server are based on the basic samples that i get from
other authors. To give you an idea, the server uses sockets,
multi-threading and a database connection to MS-SQL server 2000. the off
line messages, contacts lists, current status of the rooms and
conference rooms are stored in the database. The client app is already
done and it already meets the requirements for connecting into the
server, but my server has not been optimized to do its job since i am in
the code,debug and learn level, i'm still trying to make it stable. But
during my testing of the server it pops an error which i haven't solved
for a few weeks now especially if the server is running for a longer
period of time. I have searched to a number of sites but i wouldn't give
me the exact solution to my problem.


1.)Once the server is running more than 24 hours and receives a bunch of
chat messages from the client application it tends to slows down its
response to the client although im testing it on a single user
connection, what i did was only send a test flood of messages , then
connect and disconnect a hundred times.

2.)After a hundred of test flood messages to the server and
connect/disconnect session from the client, the server pops an exception
error such as “operation not allowed on a non-connected sockets” but
when i click ok button of the msgbox my client app sees that it is still
connected to the server. The client could still send commands such as
[user search but not on private and room chatting anymore] .

3.)When the server tries to save a data into the sql server it then
gives me another error “the statement has been terminated”.

4.)the problem that i mostly see is during login, private and room chat,
saving to database. Other strange behavior of the server is that it can
still recieve a search user command and then reply for the result but
when i try to do private or room chat, there it pops the error messages
again and no reply to the client whatsoever.
1.)Do you think can handle more than a hundred concurrent user
online or more or maybe thousand?
2.)Do you think its a good choice to have the client built in vb6 and
the chat server built in ? any ideas are welcome

Guys please i really need your help with my problems (1-4) ! especially
on socket and multi-threading. Any comments, suggestion or modification
of the code are welcome. I have provided the server code in my site,
I've omitted some of the codes and classes, to get you into the direct
point, i have posted additional information of my problem in my site and
some other screen shot of the error.

my site:

PS sorry for my poor english.
Nov 21 '05 #1
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P: n/a

Did you see this message from Jason Cooke in this newsgroup.

[ANN] August 24, "Threading with Visual Basic .NET" chat

Do you have questions about how to create multi-threaded applications? Or do
you wonder about what those threads are actually doing? Then join members of
the Visual Basic team as they answer your questions about using threading
with Visual Basic .NET.

August 24, 2004
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4:00 - 5:00 P.M. Eastern time
20:00 - 21:00 GMT
(For a list of local time zones relative to GMT, please see

Outlook Reminder:

Location: (then click the name of the chat to enter
the chat room)

For more information about Visual Basic .NET, see
To see a list of upcoming chats or set a reminder for this chat, see
For archives of previous chats, see

Jason Cooke

This posting is provided "AS IS" with no warranties, and confers no rights.
You assume all risk for your use.
(c) 2004 Microsoft Corporation. All rights reserved.

Nov 21 '05 #2

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