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Add title case to string class

using System; using System.Collections.Generic; using System.Linq; using System.Text;     public static class ExtensionLibExtensions     {         public static string ToTitleCase(this string inputString, bool forceLower)         {             inputString = inputString.Trim();             if (inputString == "")             {                 return "";             }             if (forceLower)             {                 inputString = inputString.ToLower();             }             string[] inputStringAsArray = inputString.Split(' ');             StringBuilder sb = new StringBuilder();             for (int i = 0; i < inputStringAsArray.Length; i++)             {                 if (inputStringAsArray[i].Length > 0)                 {                     sb.AppendFormat("{0}{1} ",                        inputStringAsArray[i].Substring(0, 1).ToUpper(),                        inputStringAsArray[i].Substring(1));                 }             }             return sb.ToString(0, sb.Length - 1);         }     }     class Program     {         static void Main(string[] args)         {             string sourceString = "this is a test";             Console.WriteLine("String with title casing: {0}", sourceString.ToTitleCase(true));         }     }