<?xml version='1.0'?><response><error code='1'> Success</error></response>

<?xml version='1.0'?>
<response>
<error code='1'> Success</error>
</response>

public static String PrintXML(String XML)
{
String Result = "";

MemoryStream mStream = new MemoryStream();
XmlTextWriter writer = new XmlTextWriter(mStream, Encoding.Unicode);
XmlDocument document   = new XmlDocument();

try
{
	// Load the XmlDocument with the XML.
	document.LoadXml(XML);

	writer.Formatting = Formatting.Indented;

	// Write the XML into a formatting XmlTextWriter
	document.WriteContentTo(writer);
	writer.Flush();
	mStream.Flush();

	// Have to rewind the MemoryStream in order to read
	// its contents.
	mStream.Position = 0;

	// Read MemoryStream contents into a StreamReader.
	StreamReader sReader = new StreamReader(mStream);

	// Extract the text from the StreamReader.
	String FormattedXML = sReader.ReadToEnd();

	Result = FormattedXML;
}
catch (XmlException)
{
}

mStream.Close();
writer.Close();

return Result;
}

public static String PrettyPrint(String XML)
{
    String Result = "";

    MemoryStream MS = new MemoryStream();
    XmlTextWriter W = new XmlTextWriter(MS, Encoding.Unicode);
    XmlDocument D   = new XmlDocument();

    try
    {
    	// Load the XmlDocument with the XML.
    	D.LoadXml(XML);

    	W.Formatting = Formatting.Indented;

    	// Write the XML into a formatting XmlTextWriter
    	D.WriteContentTo(W);
    	W.Flush();
    	MS.Flush();

    	// Have to rewind the MemoryStream in order to read
    	// its contents.
    	MS.Position = 0;

    	// Read MemoryStream contents into a StreamReader.
    	StreamReader SR = new StreamReader(MS);

    	// Extract the text from the StreamReader.
    	String FormattedXML = SR.ReadToEnd();

    	Result = FormattedXML;
    }
    catch (XmlException)
    {
    }

    MS.Close();
    W.Close();

    return Result;
}

class Program
{
    static void Main(string[] args)
    {
        string xml = @"<?xml version='1.0'?><response><error code='1'> Success</error></response>";

        XDocument doc = XDocument.Parse(xml);
        Console.WriteLine(doc.ToString());
    }
}