Convert all first letter to upper case, rest lower for each word

Question

I have a string of text (about 5-6 words mostly) that I need to convert.

Currently the text looks like:

THIS IS MY TEXT RIGHT NOW

I

Answer 1

jspcal's answer as a string extension.

Program.cs

class Program
{
    static void Main(string[] args)
    {
        var myText = "MYTEXT";
        Console.WriteLine(myText.ToTitleCase()); //Mytext
    }
}

StringExtensions.cs

using System;
public static class StringExtensions
{

    public static string ToTitleCase(this string str)
    {
        if (str == null)
            return null;

        return System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase(str.ToLower());
    }
}