Password im Connectionstring entschlüsseln

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private string Decrypt(string _connectionString)
{
    Regex r = new Regex(@"^.*?Password=(?<Password>[^;]*)(;|$)", RegexOptions.IgnoreCase);
    string encrypted = r.Match(_connectionString).Groups["Password"].Value;
    string decrypted = Decrypt(encrypted, key);
    return _connectionString.Replace(encrypted, decrypted);
}