C# read XML with DTD verification -

i'm trying read xml file dtd verification no mather how seems program doesn't read dtd file. have concentrated problem small xml file , small dtd file:

test.xml - located @ c:\test.xml

<?xml version="1.0"?> <!doctype product system "test.dtd"> <product productid="123">    <productname>rugby jersey</productname> </product> 

test.dtd - located @ c:\test.dtd

<!element product (productname)> <!attlist product productid cdata #required> <!element productname (#pcdata)> 

my c# program looks this

namespace xml_to_csv_converter {     public partial class form1 : form     {          public form1()         {             initializecomponent();         }          private void form1_load(object sender, eventargs e)         {             readxmlwithdtd();         }          public void readxmlwithdtd()         {             // set validation settings.             xmlreadersettings settings = new xmlreadersettings();             settings.validationtype = validationtype.dtd;             settings.dtdprocessing = dtdprocessing.parse;             settings.validationeventhandler += new validationeventhandler(validationcallback);             settings.ignorewhitespace = true;              // create xmlreader object.             xmlreader reader = xmlreader.create("c:/test.xml", settings);              // parse file.             while (reader.read())             {                 system.console.writeline("{0}, {1}: {2} ", reader.nodetype, reader.name, reader.value);             }         }          private static void validationcallback(object sender, validationeventargs e)         {             if (e.severity == xmlseveritytype.warning)                 console.writeline("warning: matching schema not found.  no validation occurred." + e.message);             else // error                 console.writeline("validation error: " + e.message);         }     } } 

this results in output:

xmldeclaration, xml: version="1.0"  documenttype, product:   validation error: 'product' element not declared. element, product:   validation error: 'productname' element not declared. element, productname:   text, : rugby jersey  endelement, productname:   endelement, product:  

i have tried have files in defferent locations , have tried both relative , absolute paths. have tried copy example microsoft webpage , resulted in same problem. have idea of can problem? there way see if program able load dtd file?

you need add resolver.

xmlreadersettings settings = new xmlreadersettings();  // set resolver settings.xmlresolver = new xmlurlresolver();  settings.validationtype = validationtype.dtd; settings.dtdprocessing = dtdprocessing.parse; settings.validationeventhandler += new validationeventhandler(validationcallback); settings.ignorewhitespace = true; 

as long 2 files in same directory, work. alternatively need provide url dtd.

xmlurlresolver can overridden provide additional semantics resolution process.