C# Working With Strings

using System;

namespace strings
{
    class Program
    {
        static void Main(string[] args)
        {

            string stringOne = "Hello World!";


            //Make a string uppercase.
            Console.WriteLine(stringOne.ToUpper());
            //Make a string lowercase.
            Console.WriteLine(stringOne.ToLower());


            //Get a character at a specific position like so(a string is essentialy an array of characters):
            char ch = stringOne[3];

            Console.WriteLine(ch);


            //Replace a charater/string within your string:
            Console.WriteLine(stringOne.Replace("Hello", "Hell"));


            //Check if your string contains a specific character 
            if (stringOne.Contains("a"))
            {
                Console.WriteLine("Yes.");
            }
            else
            {
                Console.WriteLine("No.");
            }


            //Split your string it into many strings when a specified character is encountered and store them in an array.
            string[] strings = stringOne.Split('l');

            //Display the string in the array.
            foreach (string str in strings)
            {
                Console.WriteLine(str);
            }

            Console.WriteLine("");


            //Get the index of a character/string within your string.
            Console.WriteLine(stringOne.IndexOf("Wor"));


            //Insert a character/string into your string.
            Console.WriteLine(stringOne.Insert(0, "HHH"));
            //remove a character/string from your string.
            Console.WriteLine(stringOne.Remove(0, 1));


            //Get the a part of your string between the specified positions.
            Console.WriteLine(stringOne.Substring(5, 7));


            string stringTwo = "   Trim me. ";

            //Get rid of spaces.
            Console.WriteLine(stringTwo.Trim());
            //Get rid of spaces at the front.
            Console.WriteLine(stringTwo.TrimStart());
            //Get rid of spaces at the end.
            Console.WriteLine(stringTwo.TrimEnd());


            //Joining strings.
            Console.WriteLine("Hello" + " " + "World!");
            //Or if you have an array.
            string[] words = { "Hello", " ", "World", "!" };
            Console.WriteLine(string.Concat(words));


            //Get the length of your string.
            Console.WriteLine(stringOne.Length);


            Console.ReadLine();
        }
    }
}