UdpClient not found (visual studio 10)

Question

Hello i have to do a project but one of the constraint is that i have to use visualstudio 10 with the program gadgeteer,
i have to creat a server with UdpClient but no matter what i do visual studio keep saying "udpclient not found" what can i do ?

code :

namespace UDPServeur
{
public class Program
{
private static Thread _thEcoute;

    private static void Main(string[] args)
    {
        _thEcoute = new Thread(new ThreadStart(Ecouter));
        _thEcoute.Start();
    }

    private static void Ecouter()
    {
        Console.WriteLine("Préparation à l'écoute...");

        UdpClient serveur = new UdpClient(5035);

        while (true)
        {
            IPEndPoint client = null;
            Console.WriteLine("ÉCOUTE...");

            byte[] data = serveur.Receive(ref client);
            Console.WriteLine("Données reçues en provenance de {0}:{1}.", client.Address, client.Port);

            string message = Encoding.Default.GetString(data);
            Console.WriteLine("CONTENU DU MESSAGE : {0}\n", message);
        }
    }
}

}

Answer 1

Add "using" statements.

using System.Net;    
using System.Net.Sockets;   

https://learn.microsoft.com/en-us/dotnet/framework/network-programming/using-udp-services