how to learn ip address in winsock?

you can imagine 5 gatess student coming and has ıd card student keep his/her card on the gates and we will sayy ok this is my student open the gate but we use same port number which one gate will open so we must learn gate's ip adress

class UDPAPI
{
public Socket udp_component = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
public byte[] OnReceiveBuffer = new byte[300];
public bool DataReceived = false;
public DataTerminal.Form1 f1;


public bool InitUDPOnReceive(out string msg,int HostPort)
{


msg = "";
IPEndPoint From = new IPEndPoint(IPAddress.Any, HostPort);

try
{
udp_component.Bind(From);
}
catch (SocketException ex)
{
msg = ex.SocketErrorCode.ToString();
return false;
}
udp_component.ReceiveTimeout = 2000;

IPEndPoint ipeSender = new IPEndPoint(IPAddress.Any, 0);
EndPoint epSender = (EndPoint)ipeSender;

try
{
udp_component.BeginReceive(OnReceiveBuffer, 0, OnReceiveBuffer.Length, SocketFlags.None, new AsyncCallback(OnReceive), epSender);

}
catch (SocketException ex)
{
msg = ex.SocketErrorCode.ToString();
return false;
}


return true;

}



public void OnReceive(IAsyncResult ar)
{

IPEndPoint ipeSender = new IPEndPoint(IPAddress.Any, 0);
EndPoint epSender = (EndPoint)ipeSender;

try
{

udp_component.EndReceive(ar);

//Process Incoming Data below->
//Data is now in OnReceiveBuffer
DataReceived = true;
f1.richTextBox1.AppendText(Encoding.ASCII.GetString(OnReceiveBuffer, 0, OnReceiveBuffer.Length));

//<-Process Incoming Data above


OnReceiveBuffer.Initialize();
Array.Clear(OnReceiveBuffer, 0, OnReceiveBuffer.Length);

//Start listening to receive more data from the user
udp_component.BeginReceive(OnReceiveBuffer, 0, OnReceiveBuffer.Length, SocketFlags.None, new AsyncCallback(OnReceive), epSender);

}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

ı put break point IPEndPoint From = new IPEndPoint(IPAddress.Any, HostPort);
this part ıpadress 0.0.0.0:7000
ı want to talk about 0.0.0.0 instead of an any ipadress 123.123.321.31 must be come.