//Server
using System.Net;
using System.Net.Sockets;

string xName = "string to send";
byte[] packetData = System.Text.ASCIIEncoding.ASCII.GetBytes(xName);
string IP = "127.0.0.1";
int port = 80;
IPEndPoint ep = new IPEndPoint(IPAddress.Parse(IP), port);
Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
client.SendTo(packetData, ep);



//Client
using System.Net;
using System.Net.Sockets;
using System.Collections.Specialized;
using System.Linq;

private static Exception socketException = null;
static void OpenSocket()
{
    byte[] data = new Byte[256];
    IPEndPoint ServerEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 80);
    Socket WinSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    WinSocket.ReceiveTimeout = 0;
    WinSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 0);
    WinSocket.Bind(ServerEndPoint);
    IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
    EndPoint Remote = (EndPoint)(sender);
    
    int recv = WinSocket.ReceiveFrom(data, ref Remote);
    string DataRecieved = Encoding.ASCII.GetString(data, 0, recv);
}