Print String Lower Case, Upper Case and First Letter Uppercase

using System;
using System.Globalization;
using System.Threading;
namespace ConsoleApplication10
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "surya pratap singh";
            CultureInfo culture = Thread.CurrentThread.CurrentCulture;
            TextInfo text = culture.TextInfo;
            Console.WriteLine(text.ToTitleCase(str));
            Console.WriteLine(text.ToUpper(str));
            Console.WriteLine(text.ToLower(str));
            Console.ReadLine();
        }
    }
}