// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002220/char-toupper

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        char [] input = {'E','n','t','i','t','y',' ','F','r','a','m','e','w','o','r','k',' ','6','.','2'};

        Console.WriteLine("Converted all the characters to upper case.");

​

        for (int i = 0; i < input.Length; i++)

        {

            // C# Extension Method: Char - ToUpper

            var result = input[i].ToUpper();

            Console.WriteLine("{0} : {1} ", input[i], result);

        }

    }

}