using System;

using System.Collections.Generic;

using System.Linq;

​

namespace HelloWorld

{

​

    class User{

        //members

        private int userId;

        private string firstName;

        private string lastName;

        //properties

        public int UserId{

            get{return userId;}

        }

        public string FirstName{

            get{return firstName;}

        }

        public string LastName{

            get{return lastName;}

        }        

        //methods

        public User(int uId, string fName, string lName){

            userId = uId;

            firstName = fName;

            lastName = lName;

        }

    }

  class Program

  {

    static void Main(string[] args)

    {

        User user1 = new User(181,"Arturo","Sosa");

        User user2 = new User(182,"Kevin","Sinza");

        User user3 = new User(183,"Alberto","Sinza");       

        User[] hhUsers = new User[] { user1,user2,user3 };

        string[] searchInputs = new string[]{"Kevin","Sinza"};

        IEnumerable<User> userQuery = 

            from user in hhUsers

            where user.UserId != 181 && (user.FirstName.ToLower() == string.Concat(searchInputs[0].ToLower()," ", searchInputs[1].ToLower())

                || user.LastName.ToLower() == string.Concat(searchInputs[0].ToLower(), " ", searchInputs[1].ToLower())

                || string.Concat(user.FirstName.ToLower(), " ", user.LastName.ToLower()).Contains(string.Concat(searchInputs[0].ToLower(), " ", searchInputs[1].ToLower())))

            select user;

​

        // Execute the query.

        foreach (User u in userQuery)

        {

            Console.Write(u.FirstName+' '+u.LastName);

        }              

    }

  }

}

​