I am trying to do some encryption with razor. But without any luck. I have a class in the AppCode folder I am trying to access from razor:

krypFac.cs

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

namespace Test{

public class krypFac
{
    private byte[] key = { };
    private byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };

    public string Decrypt(string stringToDecrypt, string sEncryptionKey)
    {

        byte[] inputByteArray = new byte[stringToDecrypt.Length + 1];

        try
        {

            key = System.Text.Encoding.UTF8.GetBytes(sEncryptionKey.ToCharArray(), 0, 8);
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            inputByteArray = Convert.FromBase64String(stringToDecrypt);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            System.Text.Encoding encoding = System.Text.Encoding.UTF8;
            return encoding.GetString(ms.ToArray());
        }
        catch (Exception e) {

            return e.Message;
        }    
    }

    public string Encrypt(string stringToEncrypt, string sEncryptionKey)
    {

        try
        {

            key = System.Text.Encoding.UTF8.GetBytes(sEncryptionKey.ToCharArray(), 0, 8);
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            System.Text.Encoding encoding = System.Text.Encoding.UTF8;
            return Convert.ToBase64String(ms.ToArray());
        }
        catch (Exception e)
        {

            return e.Message;
        }
    }

}
}

my view example:

@using umbraco.BusinessLogic
@using umbraco.cms.businesslogic.member
@using umbraco.cms.businesslogic.web
@using umbraco.editorControls.SettingControls.Pickers
@using DocumentType = umbraco.cms.businesslogic.web.DocumentType
@using System.Configuration;
@using Test;
@inherits Umbraco.Web.Macros.PartialViewMacroPage


@{

     string Key = ConfigurationManager.AppSettings["GetKey"];    
     var CrypteString = krypFac.Encrypt("myString", Key);

What am i doing wrong?

Is there another "Best case" solution?

Thanks in advance