How do I write XML to an encrypted file?

[chicho13]

I need to write XML data to an encrypted file. I can read/write encrypted files, but I am having trouble figuring out how to skip the file input part and do it from a MemoryStream object.This is what I have so far. Basically I just need to get a Byte[] to preform my standard encryption on it.I appreciate the awesome input. I will be testing this shortly.EDIT: After testing I am getting a "Cannot access a closed stream" exception when I try and close the memorystream object.\[code\]MemoryStream ms = new MemoryStream();XmlTextWriter xmlwriter = new XmlTextWriter(ms,Encoding.ASCII);FileStream EncryptedFileStream = new FileStream(file, FileMode.Create, FileAccess.Write);DESCryptoServiceProvider DES = new DESCryptoServiceProvider();DES.Key = ASCIIEncoding.ASCII.GetBytes("AAAAAAAA");DES.IV = ASCIIEncoding.ASCII.GetBytes("AAAAAAAA");ICryptoTransform desEncrypt = DES.CreateEncryptor();CryptoStream cryptostream = new CryptoStream(EncryptedFileStream, desEncrypt, CryptoStreamMode.Write);//create xml documentbyte[] bytearray = new byte[ms.Length];ms.Read(bytearray, 0, bytearray.Length);cryptostream.Write(bytearray, 0, bytearray.Length);cryptostream.Close();ms.Close();EncryptedFileStream.Close();\[/code\]