using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

         string str = "Johnny'S Pizza";

         Console.WriteLine(ConvertToTitleCase(str));

    }

    public static string ConvertToTitleCase(string s)

    {

       if (string.IsNullOrWhiteSpace(s))

          return string.Empty;

​

       // Creates a TextInfo based on the "en-US" culture.

       var textInfo = new CultureInfo("en-US", false).TextInfo;

​

       return textInfo.ToTitleCase(s.Trim().ToLower());

    }

}