write xml file from data table ignoring columns with white spaces

I am trying to export the data from a data table into xml file. I have this part working but when a record does not have any data or a white space it still writes the it in the xml file with XML:space Preserved.

I want to ignor the columns and not have them in xml file if they do not have any data in them

example of the xml file it is producing now

I want customer street 3 and 4 nodes to be not printed if they don't have any values in them.

here is my code

using System.IO;
using System.Linq;
using System.Text;
using System.Data;
using System.Xml.Linq;
using System;
using System.Collections.Generic;
using PdfSharp.Pdf.IO;
using PdfSharp.Pdf;
using PdfSharp.Drawing;
using System.Xml;


namespace InvoicePrintProgram

{ class XMLGenerator {

    //Defining method that generates  XMl Files
    public void Start(String XmlFilepath, string XMlFileName, DataTable DT, int PageCountOut, int SequenceCountOut, int[] PrefIndex/*, int[] SequenceIndex, IEnumerable<String> chunk, int IndexCount out int IndexCountOut*/)
    {
        // Creates Xml file from datatable using the wrtieXml method 

        FileStream streamWrite = new FileStream(XmlFilepath, System.IO.FileMode.Create);


        System.Xml.XmlWriterSettings settings = new System.Xml.XmlWriterSettings();
    settings.Indent = true;
    //settings.Encoding = System.Text.Encoding.GetEncoding("ISO-8859-1") 
    settings.Encoding = System.Text.Encoding.UTF8;
    settings.CloseOutput = true;
    settings.CheckCharacters = true;
    settings.NewLineChars = "\r\n";
    // vbCr & vbLf 

    // Write as UTF-8 with indentation 




        DT.WriteXml(streamWrite, XmlWriteMode.IgnoreSchema);




        //    foreach (DataRow dr in DT.Rows)
        //    {
        //        foreach (DataColumn col in DT.Columns)
        //        {

        //            dr[col] = dr[col].ToString().Replace(" ", "").Trim();




        //        }
        //    }

        //DT.WriteXml(streamWrite);
        //streamWrite.Close();



        XElement xEle = XElement.Load(XmlFilepath);
       // xEle = XElement.Parse(XmlFilepath, LoadOptions.PreserveWhitespace);

        // using Linq refines the file by adding the metadata details  and removes the statementnumbers from XML file.
        xEle.AddFirst(new XElement("PdfMetaData", new XElement("fileName", XMlFileName)
           , new XElement("TotalPageCount", PageCountOut)
           , new XElement("TotalPackageCount", SequenceCountOut)));
        // }
        xEle.Save(XmlFilepath);


        // Adds the pageIndex at the bottom of the XML file
        //xEle.Add(new XElement("PrefStockPageIndexes"));

        //for (int i = 0; i <= chunk.Count() - 1; i++)
        //{

        //    xEle.Add(new XElement("int", SequenceIndex[IndexCount]));
        //    IndexCount++;
        //}
        // IndexCountOut = IndexCount;
        //           public void FindFirstPage(PdfDocument document, String XmlFilePath, string referenceString)
        //    {         
        // this procedure removes any pages from the pdf document that do not contain
        // the reference string







        xEle.Add(new XElement("PrefStockPageIndexes"));

        for (int i = 0; i <= PrefIndex.Length - 1; i++)
        {

            xEle.Add(new XElement("int", PrefIndex[i]));

        }
        xEle.Save(XmlFilepath);
        //            }

    }
}

}