Hello Im trying to make a chat program like skype in c# and having some trouble gavring/updating the messages, what i tryed was foreach value in a database add it into listbox1, and i did a timer every second do that.. but it kept adding it again every second repeating like it was on loop

So then i sat down and thought how can i do this, so i come up with webclient download a list of messages by php and foreach line in the webclient add it to a listbox! is there any way of doing this?