Csharp/CSharp Tutorial/Network/Socket

Bind Socket with an IPEndPoint

using System;
using System.Net;
using System.Net.Sockets;
class MainClass
{
   public static void Main()
   {
      IPAddress ia = IPAddress.Parse("127.0.0.1");
      IPEndPoint ie = new IPEndPoint(ia, 8000);
      Socket test = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      Console.WriteLine("Blocking: {0}", test.Blocking);
      test.Bind(ie);
      IPEndPoint iep = (IPEndPoint)test.LocalEndPoint;
      Console.WriteLine("Local EndPoint: {0}",iep.ToString());
      test.Close();
   }
}

Blocking: True
Local EndPoint: 127.0.0.1:8000

Display the connected client IP address

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MainClass
{
   public static void Main()
   {
      string data;
      IPEndPoint ip = new IPEndPoint(IPAddress.Any, 9999);
      Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
      socket.Bind(ip);
      socket.Listen(10);
      Socket client = socket.Accept();
      IPEndPoint newclient = (IPEndPoint)client.RemoteEndPoint;
      Console.WriteLine("Connected with {0} at port {1}",newclient.Address, newclient.Port);
 
   }
}

Socket: AddressFamily, SocketType and ProtocolType

using System;
using System.Net;
using System.Net.Sockets;
class MainClass
{
   public static void Main()
   {
      IPAddress ia = IPAddress.Parse("127.0.0.1");
      IPEndPoint ie = new IPEndPoint(ia, 8000);
      Socket test = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      Console.WriteLine("AddressFamily: {0}",test.AddressFamily);
      Console.WriteLine("SocketType: {0}",test.SocketType);
      Console.WriteLine("ProtocolType: {0}",test.ProtocolType);

      test.Close();
   }
}

AddressFamily: InterNetwork
SocketType: Stream
ProtocolType: Tcp

Socket: Blocking and Connected

using System;
using System.Net;
using System.Net.Sockets;
class MainClass
{
   public static void Main()
   {
      IPAddress ia = IPAddress.Parse("127.0.0.1");
      IPEndPoint ie = new IPEndPoint(ia, 8000);
      Socket test = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      Console.WriteLine("Blocking: {0}", test.Blocking);
      test.Blocking = false;
      Console.WriteLine("new Blocking: {0}",test.Blocking);
      Console.WriteLine("Connected: {0}", test.Connected);
      test.Close();
   }
}

Blocking: True
new Blocking: False
Connected: False

Socket: sentTo

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
class MultiSend
{
   public static void Main()
   {
      Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
      IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050);
      
      byte[] data = Encoding.ASCII.GetBytes("This is a test message");
      server.SendTo(data, iep);
      server.Close();
   }
}