About String

using System;
class Program
{
    public static void Main(String[] args)
    {
        string str = "Mohammad rakibul Haider";
        Console.WriteLine(str);
        
        Console.WriteLine("The length of the string is: " + str.Length);
        
        string bs = str.ToLower();
        Console.WriteLine(bs);
        
        bs = str.ToUpper();
        Console.WriteLine(bs);
        
        string cs = "rakib";
        string ds = "rakib";
        if (cs.Equals(ds)) Console.WriteLine("Same");
        else Console.WriteLine("Not Same");

        Console.ReadKey();
    }
}