using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string[] Names = {"Rod", "Stewart", "Carter", "Dixon", "Marshall", "Smith", "Walker"};

        string[] lines = { 

            "Hi, I'm Carter", 

            "My name is rod Stewart", 

            "Nice to meet you, im dixon...", 

            "I am smith walker it's nice to meet you", 

            "im Carter Stewart Smith, how are you doing?",

            "There's no name here", 

            "Hi I'm late for an interview",

            "I am a retail manager",

            "I'm Dixon marshall and I have a question.",

            "Where is Rod Stewart and her dog?", 

            "I am hungry but I want to see Marshall first." 

        };

        foreach (string line in lines)

        {

            foreach (string name in Names)

            {               

                var l = line.ToUpper();

                var n = name.ToUpper();

                int i = l.IndexOf(n, 0);

                if (i >-1)

                {

                char[] r = new char[n.Length];          

                l.CopyTo(i, r, 0, n.Length);

                Console.Write(r);

                }

            }

            Console.WriteLine("");

        }

    }

}

​