An XML and File import/export question with C#

Hi experts
I imported an xml file and save it to another xml file by LINQ in C#.
_xmlDocument = XDocument.Load("input.xml", LoadOptions.PreserveWhitespace);
_xmlDocument.Save("output.xml", SaveOptions.DisableFormatting);

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I then opened the files and print out the content byte-by-byte.
using (FileStream fs = File.Open(pathAndFileName, FileMode.Open))
{
                int size = (int)fs.Length; 
                byte[] data = new byte[size]; 
                fs.Read(data, 0, size);
                foreach (byte b in data)
                     Console.WriteLine(b);
}

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But when I compared the printed output, the file "output.xml" contains some additional characters: 239, 187, 191,
where 239: Latin small letter i with diaeresis
           187: Right double angle quotes
           191: Inverted question mark

It also dropped 32 (ie Space) that was in "input.xml".

My question is: Is there any way to preserve the format of the input without adding funny characters or discarding space character?

They look identical in a text editor though.

Thanks in advance.
dominicwongAsked:
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Meir RivkinConnect With a Mentor Full stack Software EngineerCommented:
yes, use StreamWriter with Encoding.ASCII:
 using (StreamWriter sw = new StreamWriter(@"output.xml", false, Encoding.ASCII))
           {
               _xmlDocument.Save(sw, SaveOptions.DisableFormatting);
           }

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dominicwongAuthor Commented:
Thanks sedgwick for your prompt response.
It resolves the funny character problem. But now it creates one issue:

The original file was:
<?xml version="1.0" encoding="utf-8"?>

Now, the saved file became:
<?xml version="1.0" encoding="us-ascii"?>
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dominicwongAuthor Commented:
FYI, the reason they need to be identical is because I need to calculate the CRC of the file later in the program.
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Meir RivkinFull stack Software EngineerCommented:
thats true, however if u compare bytes of the two xmls u gonna find they are identical:

List<byte> xml1 = new List<byte>();
           List<byte> xml2 = new List<byte>();
           using (FileStream fs = File.Open(@"input.xml", FileMode.Open))
           {
               int size = (int)fs.Length;
               byte[] data = new byte[size];
               fs.Read(data, 0, size);
               xml1.AddRange(data);
           }
           using (FileStream fs = File.Open(@"output.xml", FileMode.Open))
           {
               int size = (int)fs.Length;
               byte[] data = new byte[size];
               fs.Read(data, 0, size);
               xml2.AddRange(data);
           }

           var countDiffBytes = xml1.Except(xml2).Count();

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countDiffBytes is equal to 0, meaning they will pass crc check.
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dominicwongAuthor Commented:
Sorry for the confusion. The later CRC calculation hasn't been included in the code (for clarity reason).
The actual code when it comes to calculating CRC is as follows.
Therefore, I do need them to be completely identical; otherwise, the CRC will be different.

            Crc32 crc32 = new Crc32(); 
            String hash = String.Empty;
            using (FileStream fs = File.Open(pathAndFileName, FileMode.Open))
            {
                foreach (byte b in crc32.ComputeHash(fs))
                    hash += b.ToString("x2").ToLower();
            }

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dominicwongAuthor Commented:
I managed to get the software requirement to change from "utf-8" to "us-ascii".
Now, it is OK. The problem is resolved.

Thanks for your help.
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dominicwongAuthor Commented:
Thank you.
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