public interface IGreeter

    {

        Task<HelloReply> SayHello(HelloRequest request);

        Task<User> Register(string name, string email, string password, string title, string city);

        Task<List<User>> List(int count);

    }

SayHello(new HelloRequest { Name = "you" });

return new HelloReply { Message = "Hello " + request.Name };

Greeter.Register("henryfan", "henryfan@msn.com", "12345678", "cxo", "guangzhou");

            return Task.FromResult(new User

            {

                Name = name,

                Email = email,

                Password = password,

                Title = title,

                City = city,

                CreateTime = DateTime.Now,

                ID= Guid.NewGuid().ToString("N")

            });

Greeter.List(10);

            List<User> items = new List<User>(count);

            for(int i=0;i<count;i++)

            {

                var item = new User {

                    Name = "henryfan",

                    City = "guangzhou",

                    Email = "henryfan@msn.com",

                    Title = "cxo",

                    Password = "12345678",

                    ID = Guid.NewGuid().ToString("N"),

                    CreateTime = DateTime.Now

                };

                items.Add(item);

            }