Title Case String extension

StringExtensions.cs

using System.Globalization;
using System.Threading;

namespace System
{
    public static class StringExtensions
    {
        public static string ToTitleCase(this string value)
        {
            if (value == null) return null;

            CultureInfo cultureInfo = Thread.CurrentThread.CurrentCulture;
            TextInfo textInfo = cultureInfo.TextInfo;
            
            return textInfo.ToTitleCase(value.ToLower());
        }
    }
}