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Can multi-app listen on the same socket port Messages   Related Types This message was discovered on microsoft.public.dotnet.framework.clr. Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions. Post a new message to this list... optman i need to receive udp datagram on port 1900, but the port is in used by other application. the code : new UdpClient(1900) fail! so ,what should i do ? please help me ,thank in advance. Reply to this message... Vote that this is a GOOD answer...   Auto-following on Twitter Ubuntu and XP on one “desktop”        Michael Giagnocavo [MVP] (VIP) If you bind to a specific IP and the other app has bound to a non-specific IP, then you should be able to get it. Otherwise, you could shutdown the app that is listening. -mike MVP "optman" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message... Vote that this is a GOOD answer...          optman I did it! just set socket option with ReuseAddress! .... IPAddress groupAddress = IPAddress.Parse("239.255.255.250"); Socket Listener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); Listener.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1); Listener.Bind(new IPEndPoint(IPAddress.Any,1900)); MulticastOption multicastOption = new MulticastOption(groupAddress); Listener.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, multicastOption); .... no need to shutdown other app ,actually i can't shut it down! "Michael Giagnocavo [MVP]" <Click here to reveal e-mail address> дÈëÏûÏ¢ÐÂÎÅ :Click here to reveal e-mail address... [Original message clipped] Reply to this message... Vote that this is a GOOD answer...       System.Net.IPAddress System.Net.IPEndPoint System.Net.Sockets.AddressFamily System.Net.Sockets.MulticastOption System.Net.Sockets.ProtocolType System.Net.Sockets.Socket System.Net.Sockets.SocketOptionLevel System.Net.Sockets.SocketOptionName System.Net.Sockets.SocketType System.Net.Sockets.UdpClient Ad BootFX Reliable and powerful .NET application framework. Recession Busting Bespoke Software Get through the recession by investing in bespoke software to decrease costs and create commercial opportunities. Other DN247 Network Sites .NET 247 SQL Server Wins Old Skool Developer

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