class Program
{
 static void Main(string[] args)
 {
  // Input strings.
  const string s1 = "samuel allen";
  const string s2 = "dot net perls";
  const string s3 = "Uppercase first letters of all words in the string.";
  // Write output strings.
  Console.WriteLine(TextTools.UpperFirst(s1));
  Console.WriteLine(TextTools.UpperFirst(s2));
  Console.WriteLine(TextTools.UpperFirst(s3));
  Console.ReadKey();
 }
 }
 public static class TextTools
 {
 /// <summary>
 /// Uppercase first letters of all words in the string.
 /// </summary>
 public static string UpperFirst(string s)
 {
  return Regex.Replace(s, @"\b[a-z]\w+", delegate(Match match)
  {
  string v = match.ToString();
  return char.ToUpper(v[0]) + v.Substring(1);
  });
 }
}