AnonymousFunction (demo), C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

//Help URL
//https://msdn.microsoft.com/en-us/library/bb549151(v=vs.110).aspx
namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            //Method 1
            /*Func<string, string> convertMethod = UppercaseString;
            string name="Lokesh";
            Console.WriteLine(UppercaseString(name));*/
            
            //Method 2
            /*Func<string, string> convertMethod = delegate(string s){
                return s.ToUpper();
            };
            string name = "Lokesh";
            Console.WriteLine(convertMethod(name));*/
            
            //Method3
            Func<string, string> convertMethod = s => s.ToUpper();
            //Console.WriteLine(convertMethod("Lokesh"));
            // Create an array of strings.
              string[] words = { "orange", "apple", "Article", "elephant" };
              // Query the array and select strings according to the selector method.
              IEnumerable<String> aWords = words.Select(convertMethod);

// Output the results to the console.
              foreach (String word in aWords)
                 Console.WriteLine(word);
            
        }
        
        private static string UppercaseString(string inputString){
             return inputString.ToUpper();
        }
    }
}

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