Encrypt String

using System.Security.Cryptography;

private string encryptString(string strToEncrypt)
{
    UTF8Encoding ue = new UTF8Encoding();
    byte[] bytes = ue.GetBytes(strToEncrypt);

    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
    byte[] hashBytes = md5.ComputeHash(bytes);

    // Bytes to string
    return System.Text.RegularExpressions.Regex.Replace
        (BitConverter.ToString(hashBytes), "-", "").ToLower();
}

MessageBox.Show(encryptString("Sinpin"));