clipped from www.c-sharpcorner.com

//Create an instance of UdpClient.
UdpClient udpClient = new UdpClient(serverName, SAMPLEUDPPORT);
Byte[] inputToBeSent = new Byte[256];
inputToBeSent = System.Text.Encoding.ASCII.GetBytes(whatEver.ToCharArray());
IPHostEntry remoteHostEntry = Dns.GetHostByName(serverName);
IPEndPoint remoteIpEndPoint = new IPEndPoint(remoteHostEntry.AddressList[0], SAMPLEUDPPORT);
int nBytesSent = udpClient.Send(inputToBeSent, inputToBeSent.Length);
Byte[] received = new Byte[512];
received = udpClient.Receive(ref remoteIpEndPoint);
String dataReceived = System.Text.Encoding.ASCII.GetString(received);
Console.WriteLine(dataReceived);
udpClient.Close();