AES Encryption - C#

CryptoUtil.cs

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

namespace CryptoUtil
{
    class CryptoUtil
    {
        static String SECRET_KEY = "secretKey";
        static String VECTOR_INIT = "vectorInit";

        static void Main(string[] args)
        {

            String plain = "hola";
            String encryted = Encrypt(plain);
            String decrypted = Decrypt(encryted);
            Console.WriteLine("plain: " + plain);
            Console.WriteLine("encryted: " + encryted);
            Console.WriteLine("decrypted: " + decrypted);

        }

        private static AesManaged CreateAes()
        {
            var aes = new AesManaged();
            aes.Key = System.Text.Encoding.UTF8.GetBytes(SECRET_KEY); //UTF8-Encoding
            aes.IV = System.Text.Encoding.UTF8.GetBytes(VECTOR_INIT);//UT8-Encoding
            return aes;
        }

        static String Encrypt(String plainText)
        {
            using (AesManaged aes = CreateAes())
            {
                ICryptoTransform encryptor = aes.CreateEncryptor();
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter sw = new StreamWriter(cs))
                            sw.Write(plainText);
                        return Convert.ToBase64String(ms.ToArray());
                    }
                }
            }
        }


        static string Decrypt(String encryptedText)
        {
            using (var aes = CreateAes())
            {
                ICryptoTransform decryptor = aes.CreateDecryptor();
                using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(encryptedText)))
                {
                    using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader reader = new StreamReader(cs))
                        {
                            return reader.ReadToEnd();
                        }
                    }
                }

            }
        }


    }
}