June 2003
Intermediate to advanced
800 pages
34h 20m
English
Content preview from Microsoft® Visual Basic® .NET Programmer's CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Send a Broadcast Message
Problem
You want to send a message to every user on the local subnet.
Solution
Use the UdpClient class with the appropriate broadcast address.
Discussion
Broadcasts are network messages that are forwarded to all the devices on a local subnet. When a broadcast message is received, the client decides whether to discard (depending on whether any application is monitoring the appropriate port). Broadcasts can’t travel beyond a subnet because routers block all broadcast messages. Otherwise, the network could be swamped in traffic.
To send a broadcast message, you use a broadcast IP address, which is the IP address that identifies the network and has all the host bits set to 1. For example, if the network is identified by the first ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.