Writing XML files using XmlTextWriter with ISO-8859-1 encoding (C#)

MemoryStream stream = new MemoryStream();
XmlTextWriter xmlTextWriter = new XmlTextWriter(stream, Encoding.GetEncoding("ISO-8859-1"));
xmlTextWriter.Formatting = Formatting.Indented;
xmlTextWriter.WriteStartDocument(); //Start doc

xmlTextWriter.WriteCData(myNorwegianText);

FileStream myFile = new FileStream(myPath, FileMode.Create);
StreamWriter sw = new StreamWriter(myFile);

stream.Position = 0;
StreamReader sr = new StreamReader(stream);
string content = sr.ReadToEnd();

sw.Write(content);
sw.Flush();

myFile.Flush();
myFile.Close();

Encoding encoding = Encoding.GetEncoding("ISO-8859-1");

    FileStream myFile = new FileStream(myPath, FileMode.Create);
    StreamWriter sw = new StreamWriter(myFile, encoding);

    stream.Position = 0;
    StreamReader sr = new StreamReader(stream, encoding);
    string content = sr.ReadToEnd();

    sw.Write(content);
    sw.Flush();

    myFile.Flush();
    myFile.Close();