using System;

using System.IO;

using System.Xml;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var xmlText = @"<GetMaterialData><Materials><Material><MaterialCode>144C0250</MaterialCode></Material><Material><MaterialCode>144C0253</MaterialCode></Material><Material><MaterialCode>144C0251</MaterialCode></Material><Material><MaterialCode>144C0252</MaterialCode></Material></Materials></GetMaterialData>";

        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(xmlText);

            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;

            Console.WriteLine(Result);

        }

        catch(Exception)

        {

        }

    }

}