Reading from a cryptostream to the end of the stream

Question

I\'m having some trouble with the code below. I have a file in a temporary location which is in need of encryption, this function encrypts that data which is then stored at

Answer 1

The KeySize must be specified first. This looks like a bug e.g. this works

            using (var aes = new AesManaged())
            {
                aes.KeySize = 256;
                aes.Mode = CipherMode.CBC;
                aes.IV = iv;
                aes.Key = passwordHash;
                aes.Padding = PaddingMode.PKCS7;

but this doesn't

            using (var aes = new AesManaged())
            {
                aes.Mode = CipherMode.CBC;
                aes.IV = iv;
                aes.Key = passwordHash;
                aes.Padding = PaddingMode.PKCS7;
                aes.KeySize = 256;