using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class ServiceClient
    {
        public ServiceClient(string address, int port) { }
        public IEnumerable<string>ProcessRequests( IEnumerable<string> next )
        {
            foreach (var req in next)
            {
                yield return req + " Done";
            }
        }
    }
    class Program
    {
        static IEnumerable<string> GenerateRequest()
        {
            for (int i = 0; i < 20; i++)
            {
                yield return string.Format( "get_user({0})", i );
            }
        }
        static void Main(string[] args)
        {
            var client = new ServiceClient("", 0);
            foreach (var s in client.ProcessRequests( GenerateRequest() ))
            {
                System.Console.WriteLine(s);
            }
        }
    }
}