c# - Write to existing xml file without replacing it's contents (XmlWriter) -

i encountered following issue,

i first write xml file this:

 xmltextwriter writer = new xmltextwriter("course.xml", null);  writer.formatting = formatting.indented;  writer.writestartdocument();   writer.writestartelement("course");  writer.writeattributestring("title", "examle");  writer.writeattributestring("started", "true");   writer.writeendelement();  writer.writeenddocument();  writer.close(); 

and xml output is:

<?xml version="1.0"?> <course title="example" started="true" /> 

after want write more data xml file use code again:

xmltextwriter writer = new xmltextwriter("course.xml", null); writer.formatting = formatting.indented; writer.writestartdocument();  writer.writestartelement("course");        writer.startelement("level");               writer.startelement("module");               writer.endelement();        writer.endelement(); writer.writeendelement();  writer.writeenddocument(); writer.close(); 

and xml output is:

<?xml version="1.0"?> <course>     <level>         <module>         </module>     </level> </course> 

so replaces original data, , attributes in course tag. therefore need way doesn't replace data, instead add inside existing tags.

xml files sequential text files. not database or random-access file. there no way write middle of them.