public class Soundex

{

       private Soundex()

       {

       }

       public static String SoundexCodeConverter(String s_String)

       {

              String s_word = s_String.ToUpper();

              StringBuilder s_soundexCode = new StringBuilder();

              int i_wordLength = s_word.Length;

              s_soundexCode.Append(s_word.Substring(0,1));

              for ( int i=1; i

              {

                     String s_transformedChar = Transform(s_word.Substring(i,1));

                     if (!s_transformedChar.Equals( s_soundexCode.ToString().Substring(s_soundexCode.Length - 1) ))

                     {

                           if (!s_transformedChar.Equals("A") && !s_transformedChar.Equals("S"))

                           {

                                  if (!s_transformedChar.Equals(" "))

                                  {

                                          s_soundexCode.Append(s_transformedChar);

                                  }

                           }  

                     }

              }

              s_soundexCode.Append("0000");

              return s_soundexCode.ToString().Substring(0,4);

       }

}

private static String Transform(String s_String)

{

       switch (s_String)

       {

              case "A":

              case "E":

              case "I":

              case "O":

              case "U":

              case "Y":

                     return "A";

              case "H":

              case "W":

                     return "S";

              case "B":

              case "F":

              case "P":

              case "V":

                     return "1";

              case "C":

              case "G":

              case "J":

              case "K":

              case "Q":

              case "S":

              case "X":

              case "Z":

                     return "2";

              case "D":

              case "T":

                     return "3";

              case "L":

                     return "4";

              case "M":

              case "N":

                     return "5";

              case "R":

                     return "6";

       }

       return " ";  

}