Converting Stream to String and back…what are we missing?

string test = "Testing 1-2-3";

// convert string to stream
byte[] byteArray = Encoding.ASCII.GetBytes(test);
 MemoryStream stream = new MemoryStream(byteArray);

// convert stream to string
StreamReader reader = new StreamReader(stream);
string text = reader.ReadToEnd();

var stream = new MemoryStream();
var streamWriter = new StreamWriter(stream, System.Text.Encoding.UTF8);
Serializer.Serialize<SuperExample>(streamWriter, test);

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public static string Serialize<T>(T value) {

    if(value == null) {
        return null;
    }

    XmlSerializer serializer = new XmlSerializer(typeof(T));

    XmlWriterSettings settings = new XmlWriterSettings();
    settings.Encoding = new UnicodeEncoding(false, false); // no BOM in a .NET string
    settings.Indent = false;
    settings.OmitXmlDeclaration = false;

    using(StringWriter textWriter = new StringWriter()) {
        using(XmlWriter xmlWriter = XmlWriter.Create(textWriter, settings)) {
            serializer.Serialize(xmlWriter, value);
        }
        return textWriter.ToString();
    }
}

public static T Deserialize<T>(string xml) {

    if(string.IsNullOrEmpty(xml)) {
        return default(T);
    }

    XmlSerializer serializer = new XmlSerializer(typeof(T));

    XmlReaderSettings settings = new XmlReaderSettings();
    // No settings need modifying here

    using(StringReader textReader = new StringReader(xml)) {
        using(XmlReader xmlReader = XmlReader.Create(textReader, settings)) {
            return (T) serializer.Deserialize(xmlReader);
        }
    }
}