Method to Transform XML using xslt and save to target XML

using System.Xml;
using System.Xml.XPath;
using System.Xml.Xsl;
using System.IO;
using System.Text;

    /// 

    /// Method to transform XML to another format using xslt file
    /// 

    /// 
    /// 
    /// 
    private void Transform(string resultFileName, string orgXMLFile, string xsltFile)
    {
        string resultDoc = Server.MapPath(resultFileName);
        string xmlPath = Server.MapPath(orgXMLFile);
        string xslPath = Server.MapPath(xsltFile);
        XmlTextWriter writer = null;
        StreamReader reader = null;
        XmlTextReader xmlReader = null;
        FileStream fs = null;
        XPathDocument doc = null;
        XslCompiledTransform xslDoc = null;
        try
        {
            //Create a file stream to read the XML file to be transformed
            fs = new FileStream(xmlPath, FileMode.Open,FileAccess.Read);
            reader = new StreamReader(fs, Encoding.UTF8);
            
            //Load the file to XML reader
            xmlReader = new XmlTextReader(reader);
            
            //Instantiate the XPathDocument Class
            doc = new XPathDocument(xmlReader);

            //create a XML text writer for the target xml file which will contain the transformed XML
            writer = new XmlTextWriter(resultDoc, null);

            //Instantiate the XslTransform Class
            xslDoc = new XslCompiledTransform();
            //Load the XSLT
            xslDoc.Load(xslPath);
            //Transform
            xslDoc.Transform(doc, null, writer);

            //Close Readers and writers
            writer.Close();
            reader.Close();
            xmlReader.Close();

        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            writer = null;
            reader = null;
            xmlReader = null;
            fs = null;
            xslDoc = null;
            doc = null;
        }
    }