XML : Complex XML structure for inserting records (C#)

I need to write to XML file with complex structure.

My valid xml structure is like following.

    <ads>  <ad id="00121" date="1/1/2016 01:01:59"  >      <adinfo title="" email="" phone="" rOD="" rPrice="" rat="" cdetails="" address="" postal="" />      <adimg>          <img mail="T" src=""/>          <img mail="F" src=""/>          <img mail="F" src=""/>      </adimg>  </ad>    <ad id="00121" date="1/1/2016 01:01:59"  >      <adinfo title="" email="" phone="" rOD="" rPrice="" rat="" cdetails="" address="" postal="" />      <adimg>          <img mail="T" src=""/>          <img mail="F" src=""/>          <img mail="F" src=""/>      </adimg>  </ad>    ....  ....  </ads>    

I have read this tutorial http://www.dotnetperls.com/xmlwriter

But above tutorial is for simple XML structure.

As you can see my XML is bit complex.

For example I need to insert ad inside parent ads element

What should I use and how I can approach to solving this problem?

thnx