Encrypt Password in C#

 public static string Encrypt( string strEncryptWord)

 {

     byte[] sByBuf = Encoding.ASCII.GetBytes(strHastobeEncryptWord);

     for (int nCtr = 0; nCtr < sByBuf.Length; nCtr++)

     sByBuf[nCtr] = Convert.ToByte(Convert.ToInt64(sByBuf[nCtr]) + 4);

     string strEncryptedWord = Encoding.ASCII.GetString(sByBuf);

     return strEncryptedWord;

}