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XmlValidatingReader.ValidationType Property

Gets or sets a value indicating the type of validation to perform.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public ValidationType ValidationType { get; set; }

Property Value

Type: System.Xml.ValidationType
One of the ValidationType values. If this property is not set, it defaults to ValidationType.Auto.


Setting the property after a Read has been called.


The XmlValidatingReader class is obsolete in .NET Framework version 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see Validating XML Data with XmlReader.

This property must be set before the first call to Read. Setting this property to ValidationType.None creates a non-validating reader.

If external document type definitions (DTDs) or schemas are needed for validation, the XmlResolver is used.

For more information, see Validation of XML with XmlValidatingReader and Validation Types of the XmlValidatingReader.

The following example validates two files.

using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;

public class Sample
  private const String doc1 = "notValid.xml";
  private const String doc2 = "cdDTD.xml";
  private const String doc3 = "book1.xml";

  private XmlTextReader txtreader = null;
  private XmlValidatingReader reader = null;
  private Boolean m_success = true;

  public Sample ()
      //Parse the files and validate when requested.
      Validate(doc1, ValidationType.XDR);  //Validation should fail.
      Validate(doc2, ValidationType.DTD);  //Validation should fail.
      Validate(doc3, ValidationType.None); //No validation performed.


  public static void Main ()
      Sample validation = new Sample();

  private void Validate(String filename, ValidationType vt)
        //Implement the readers.  Set the ValidationType.
        txtreader = new XmlTextReader(filename);
        reader = new XmlValidatingReader(txtreader);
        reader.ValidationType = vt;

        //If the reader is set to validate, set the event handler.
        if (vt==ValidationType.None)
           Console.WriteLine("\nParsing XML file " + filename.ToString());
           Console.WriteLine("\nValidating XML file " + filename.ToString());
           m_success = true;
           //Set the validation event handler.
           reader.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);

        // Read XML data
        while (reader.Read()){}

        if (vt==ValidationType.None)
           Console.WriteLine("Finished parsing file.");
          Console.WriteLine ("Validation finished. Validation {0}", (m_success==true ? "successful" : "failed"));

        //Close the reader.
        if (reader != null)


  //Display the validation errors.
  private void ValidationCallBack (object sender, ValidationEventArgs args)
     m_success = false;

     Console.Write("\r\n\tValidation error: " + args.Message);


The sample uses the following four input files:

notValid.xml (The "x-schema:" prefix identifies the XML-Data Reduced (XDR) schema for the reader.)

<?xml version='1.0'?>
<bookstore xmlns="x-schema:schema1.xdr">
  <book genre="novel" style="hardcover">
    <title>The Handmaid's Tale</title>
  <book genre="novel" style="other">
    <title>The Poisonwood Bible</title>


<?xml version="1.0"?>
 <Schema xmlns="urn:schemas-microsoft-com:xml-data"
   <ElementType name="first-name" content="textOnly"/>
   <ElementType name="last-name" content="textOnly"/>
   <ElementType name="name" content="textOnly"/>
   <ElementType name="price" content="textOnly" dt:type="fixed.14.4"/>
   <ElementType name="author" content="eltOnly" order="one">
     <group order="seq">
       <element type="name"/>
     <group order="seq">
       <element type="first-name"/>
       <element type="last-name"/>
   <ElementType name="title" content="textOnly"/>
   <AttributeType name="genre" dt:type="string"/>
   <AttributeType name="style" dt:type="enumeration"
         dt:values="paperback hardcover"/>
   <ElementType name="book" content="eltOnly">
     <attribute type="genre" required="yes"/>
     <attribute type="style" required="yes"/>
     <element type="title"/>
     <element type="author"/>
     <element type="price"/>
   <ElementType name="bookstore" content="eltOnly">
     <element type="book"/>


<!--XML file using a DTD-->
<!DOCTYPE bookstore [
  <!ELEMENT bookstore (cd)*> 
  <!ELEMENT cd (title,artist,price)>
  <!ELEMENT title (#PCDATA)>
  <!ELEMENT artist (#PCDATA)>
  <!ELEMENT price (#PCDATA)>]>
  <cd genre="alternative"  ISBN="2-3631-4">


<?xml version='1.0' ?>
<!DOCTYPE book [<!ENTITY h 'hardcover'>]>
  <title>Pride And Prejudice</title>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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