title: Problem validation a XML file with a local DTD file in C#
body: <p>I'm triying to validate a XML file. I'm using this code</p>
  
  <pre><code>XmlReaderSettings settings = new XmlReaderSettings();
  settings.ProhibitDtd = false;
  settings.ValidationType = ValidationType.DTD;
  
  settings.ValidationEventHandler += new ValidationEventHandler(validationError);        
  
  XmlSchemaSet schemas = new XmlSchemaSet();
  settings.Schemas = schemas;
  XmlReader reader = XmlReader.Create(lblXmlPath.Text, settings);
  
  reader.Settings.Schemas.Add(null, lblDTDPath.Text);
  while (reader.Read())
  { 
            // empty by now
  }
  reader.Close();
  </code></pre>
  
  <p>But in the line "reader.Settings.Schemas.Add(null, lblDTDPath.Text);" Visual Studio show me that error "For security reasons DTD is prohibited in this XML document. To enable DTD processing set the ProhibitDtd property on XmlReaderSettings to false and pass the settings into XmlReader.Create method"</p>
  
  <p>As you can see in the code, ProhibitDtd is setted to false (I verified during debug too). I also tried to add the Schema before call to XmlReader.Create() with no success.</p>