using System;

public class Program

{

    delegate string UppercaseDelegate(string input);

    static string UppercaseFirst(string input)

    {

        char[] buffer = input.ToCharArray();

        buffer[0] = char.ToUpper(buffer[0]);

        return new string(buffer);

    }

    static string UppercaseLast(string input)

    {

        char[] buffer = input.ToCharArray();

        buffer[buffer.Length - 1] = char.ToUpper(buffer[buffer.Length - 1]);

        return new string(buffer);

    }

​

    static string UppercaseAll(string input)

    {

        return input.ToUpper();

    }

​

    static void WriteOutput(string input, UppercaseDelegate del)

    {

        Console.WriteLine("Your string before: {0}", input);

        Console.WriteLine("Your string after: {0}", del(input));

    }   

    public static void Main()

    {

        //WriteOutput("perls", new UppercaseDelegate(UppercaseFirst));

        //WriteOutput("perls", new UppercaseDelegate(UppercaseLast));

        WriteOutput("perls", new UppercaseDelegate(UppercaseAll));

    }

}