windows phone 8 “Padding is invalid and cannot be removed” using AesManaged

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encryption

Windows-Phone-8

I am getting error "Padding is invalid and cannot be removed." when trying to decrypt file contents in chunks(using buffer). I am able to decrypt whole file at once but not in blocks. I found many links regarding this problem and most of them suggested to set Padding of AesManaged object like aesManaged.Padding = PaddingMode.None But this property is not available in window phone application. Below is method:

internal static byte[] DecryptBytes(byte[] cipherText, string password)
    {
        // Check arguments.
        if (cipherText == null || cipherText.Length <= 0)
            throw new ArgumentNullException("cipherText");

        byte[] decryptedBytes= new byte[cipherText.Length];

        using (var rijAlg = new AesManaged { KeySize = 256, BlockSize = 128 })
        {
        var key = new Rfc2898DeriveBytes(password, Encoding.UTF8.GetBytes(Salt));
            rijAlg.Key = key.GetBytes(rijAlg.KeySize / 8);
            rijAlg.IV = key.GetBytes(rijAlg.BlockSize / 8);

            // Create a decrytor to perform the stream transform.
            ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);

            // Create the streams used for decryption.
            using (var msDecrypt = new MemoryStream())
            {
                using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Write))
                {
                    csDecrypt.Write(cipherText, 0, cipherText.Length);
                    csDecrypt.FlushFinalBlock();

                }
                decryptedBytes = msDecrypt.ToArray();
            }

        }
        return decryptedBytes;
    }

Please suggest issue in above code or any other workaround