using System;

using System.Collections.Generic;

using System.Linq;

​

public class Client

{

    public string Name { get;set; }

}

​

​

public class Foo

{

    private List<Client> list = new List<Client>();

    public Foo() {

        list.Add(new Client { Name = "John" });

        list.Add(new Client { Name = "Doe" });

    }

    public IQueryable<Client> GetAllClients()

    {

        return list.AsQueryable();

    }

    public Client MethodA()

    {

        return (from item in GetAllClients() 

             where item.Name.Equals("John", StringComparison.InvariantCultureIgnoreCase)

             select item).FirstOrDefault();

    }

    public Client MethodB()

    {

        var allItems = GetAllClients();

        return (from item in allItems

             where item.Name.Equals("Doe", StringComparison.InvariantCultureIgnoreCase)

             select item).FirstOrDefault();

    }

}

​

public class Program

{

    public static void Main()

    {

        var foo = new Foo();

        Console.WriteLine(foo.MethodA().Name);

        Console.WriteLine(foo.MethodB().Name);

​

    }

}