kms Crypto AESDecrypter Decrypt Partial 2

AESDecrypter.cs

string plainText = String.Empty;
byte[] byteData = Convert.FromBase64String(encryptionPackage.CipherText);

using (Aes aes = Aes.Create())
{
    using (MemoryStream memoryStream = new MemoryStream(byteData))
    {
        using (CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(key, _iv), CryptoStreamMode.Read))
        {
            using (StreamReader streamReader = new StreamReader(cryptoStream))
            {
                plainText = streamReader.ReadToEnd();
            }
        }
    }

}

return plainText;