can i get ip address of another system in chatting time

string ip;
  if (Context.Request.ServerVariables["HTTP_VIA"] != null) // using proxy
  {
      ip = Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
      // Return real client IP.
  }
  else// not using proxy or can't get the Client IP
  {
      ip = Context.Request.ServerVariables["REMOTE_ADDR"].ToString();
      //While it can't get the Client IP, it will return proxy IP.
  }