ASP.NET Tutorial/XML/XmlReader

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Optimizing XmlReader with a NameTable (C#)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Xml;
using System.Xml.Schema;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int bookcount = 0;
        XmlReaderSettings settings = new XmlReaderSettings();
        NameTable nt = new NameTable();
        object book = nt.Add("book");
        settings.NameTable = nt;
        string booksSchemaFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xsd");
        settings.Schemas.Add(null, XmlReader.Create(booksSchemaFile));
        settings.ValidationType = ValidationType.Schema;
        settings.ValidationFlags =
        XmlSchemaValidationFlags.ReportValidationWarnings;
        settings.ValidationEventHandler +=
                new ValidationEventHandler(settings_ValidationEventHandler);
        settings.IgnoreWhitespace = true;
        settings.IgnoreComments = true;
        string booksFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xml");
        using (XmlReader reader = XmlReader.Create(booksFile, settings))
        {
            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element && book.Equals(reader.LocalName)) 
                {
                    bookcount++;
                }
            }
        }
        Response.Write(String.Format("Found {0} books!", bookcount));
    }
    void settings_ValidationEventHandler(object sender, System.Xml.Schema.ValidationEventArgs e)
    {
        Response.Write(e.Message);
    }
}
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.ru" xmlns="http://example.books.ru" targetNamespace="http://example.books.ru" elementFormDefault="qualified">
  <xsd:element name="bookstore" type="bookstoreType" />
  <xsd:complexType name="bookstoreType">
    <xsd:sequence maxOccurs="unbounded">
      <xsd:element name="book" type="bookType" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="bookType">
    <xsd:sequence>
      <xsd:element name="title" type="xsd:string" />
      <xsd:element name="author" type="authorName" />
      <xsd:element name="price" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="genre" type="xsd:string" />
    <xsd:attribute name="publicationdate" type="xsd:string" />
    <xsd:attribute name="ISBN" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="authorName">
    <xsd:sequence>
      <xsd:element name="first-name" type="xsd:string" />
      <xsd:element name="last-name" type="xsd:string" />
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>


Optimizing XmlReader with a NameTable (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
           Handles Me.Load
        Dim bookcount As Integer = 0
        Dim settings As New XmlReaderSettings()
        Dim nt As New NameTable()
        Dim book As Object = nt.Add("book")
        settings.NameTable = nt
        Dim booksSchemaFile As String = Path.rubine(Request.PhysicalApplicationPath, "Data.xsd")
        settings.Schemas.Add(Nothing, XmlReader.Create(booksSchemaFile))
        settings.ValidationType = ValidationType.Schema
        settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings
        AddHandler settings.ValidationEventHandler, AddressOf settings_ValidationEventHandler
        settings.IgnoreWhitespace = True
        settings.IgnoreComments = True
        Dim booksFile As String = _
            Path.rubine(Request.PhysicalApplicationPath, "Data.xml")
        Using reader As XmlReader = XmlReader.Create(booksFile, settings)
            While (reader.Read())
                If (reader.NodeType = XmlNodeType.Element _
                    And book.Equals(reader.LocalName)) Then
                    bookcount += 1
                End If
            End While
        End Using
        Response.Write(String.Format("Found {0} books!", bookcount))
    End Sub
    Sub settings_ValidationEventHandler(ByVal sender As Object, _
            ByVal e As System.Xml.Schema.ValidationEventArgs)
        Response.Write(e.Message)
    End Sub

End Class
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.ru" xmlns="http://example.books.ru" targetNamespace="http://example.books.ru" elementFormDefault="qualified">
  <xsd:element name="bookstore" type="bookstoreType" />
  <xsd:complexType name="bookstoreType">
    <xsd:sequence maxOccurs="unbounded">
      <xsd:element name="book" type="bookType" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="bookType">
    <xsd:sequence>
      <xsd:element name="title" type="xsd:string" />
      <xsd:element name="author" type="authorName" />
      <xsd:element name="price" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="genre" type="xsd:string" />
    <xsd:attribute name="publicationdate" type="xsd:string" />
    <xsd:attribute name="ISBN" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="authorName">
    <xsd:sequence>
      <xsd:element name="first-name" type="xsd:string" />
      <xsd:element name="last-name" type="xsd:string" />
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>


Processing XML with an XmlReader (C#)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Xml;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int bookcount = 0;
        XmlReaderSettings settings = new XmlReaderSettings();
        settings.IgnoreWhitespace = true;
        settings.IgnoreComments = true;
        string booksFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xml");
        using (XmlReader reader = XmlReader.Create(booksFile, settings))
        {
            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element &&
                        "book" == reader.LocalName)
                {
                    bookcount++;
                }
            }
        }
        Response.Write(String.Format("Found {0} books!", bookcount));
    }
}
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>


Processing XML with an XmlReader (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports System.IO
Imports System.Xml
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
           Handles Me.Load
        Dim bookcount As Integer = 0
        Dim settings As New XmlReaderSettings()
        settings.IgnoreWhitespace = True
        settings.IgnoreComments = True
        Dim booksFile As String = _
            Path.rubine(Request.PhysicalApplicationPath, "Data.xml")
        Using reader As XmlReader = XmlReader.Create(booksFile, settings)
            While (reader.Read())
                If (reader.NodeType = XmlNodeType.Element _
                        And "book" = reader.LocalName) Then
                    bookcount += 1
                End If
            End While
        End Using
        Response.Write(String.Format("Found {0} books!", bookcount))
    End Sub
End Class
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>


Using XmlReader.ReadElementContentAs (C#)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Xml;
using System.Xml.Schema;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int bookcount = 0;
        decimal booktotal = 0; 
        XmlReaderSettings settings = new XmlReaderSettings();
        NameTable nt = new NameTable();
        object book = nt.Add("book");
        object price = nt.Add("price"); 
        settings.NameTable = nt;
        string booksSchemaFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xsd");
        settings.Schemas.Add(null, XmlReader.Create(booksSchemaFile));
        settings.ValidationType = ValidationType.Schema;
        settings.ValidationFlags =
        XmlSchemaValidationFlags.ReportValidationWarnings;
        settings.ValidationEventHandler += new ValidationEventHandler(settings_ValidationEventHandler);
        settings.IgnoreWhitespace = true;
        settings.IgnoreComments = true;
        string booksFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xml");
        using (XmlReader reader = XmlReader.Create(booksFile, settings))
        {
            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element && book.Equals(reader.LocalName)) 
                {
                    bookcount++;
                }
                if (reader.NodeType == XmlNodeType.Element && price.Equals(reader.LocalName))
                {
                    booktotal +=
                        (decimal)reader.ReadElementContentAsObject();
                }
            }
        }
        Response.Write(String.Format("Found {0} books that total {1:C}!",
            bookcount, booktotal));
    }
    void settings_ValidationEventHandler(object sender, System.Xml.Schema.ValidationEventArgs e)
    {
        Response.Write(e.Message);
    }
}
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.ru" xmlns="http://example.books.ru" targetNamespace="http://example.books.ru" elementFormDefault="qualified">
  <xsd:element name="bookstore" type="bookstoreType" />
  <xsd:complexType name="bookstoreType">
    <xsd:sequence maxOccurs="unbounded">
      <xsd:element name="book" type="bookType" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="bookType">
    <xsd:sequence>
      <xsd:element name="title" type="xsd:string" />
      <xsd:element name="author" type="authorName" />
      <xsd:element name="price" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="genre" type="xsd:string" />
    <xsd:attribute name="publicationdate" type="xsd:string" />
    <xsd:attribute name="ISBN" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="authorName">
    <xsd:sequence>
      <xsd:element name="first-name" type="xsd:string" />
      <xsd:element name="last-name" type="xsd:string" />
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>


Using XmlReader.ReadElementContentAs (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
           Handles Me.Load
        Dim bookcount As Integer = 0
        Dim booktotal As Decimal = 0
        Dim settings As New XmlReaderSettings()
        Dim nt As New NameTable()
        Dim book As Object = nt.Add("book")
        Dim price As Object = nt.Add("price")
        settings.NameTable = nt
        Dim booksSchemaFile As String = Path.rubine(Request.PhysicalApplicationPath, "Data.xsd")
        settings.Schemas.Add(Nothing, XmlReader.Create(booksSchemaFile))
        settings.ValidationType = ValidationType.Schema
        settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings
        AddHandler settings.ValidationEventHandler, _
        AddressOf settings_ValidationEventHandler
        settings.IgnoreWhitespace = True
        settings.IgnoreComments = True
        Dim booksFile As String = _
            Path.rubine(Request.PhysicalApplicationPath, "Data.xml")
        Using reader As XmlReader = XmlReader.Create(booksFile, settings)
            While (reader.Read())
                If (reader.NodeType = XmlNodeType.Element _
                    And book.Equals(reader.LocalName)) Then
                    "A subtle, but significant change!
                    bookcount += 1
                End If
                If (reader.NodeType = XmlNodeType.Element And price.Equals(reader.LocalName)) Then
                    booktotal += CType(reader.ReadElementContentAsObject(), Decimal)
                End If
            End While
        End Using
        Response.Write(String.Format("Found {0} books that total {1:C}!", _
                bookcount, booktotal))
    End Sub
    Sub settings_ValidationEventHandler(ByVal sender As Object, _
            ByVal e As System.Xml.Schema.ValidationEventArgs)
        Response.Write(e.Message)
    End Sub
End Class
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.ru" xmlns="http://example.books.ru" targetNamespace="http://example.books.ru" elementFormDefault="qualified">
  <xsd:element name="bookstore" type="bookstoreType" />
  <xsd:complexType name="bookstoreType">
    <xsd:sequence maxOccurs="unbounded">
      <xsd:element name="book" type="bookType" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="bookType">
    <xsd:sequence>
      <xsd:element name="title" type="xsd:string" />
      <xsd:element name="author" type="authorName" />
      <xsd:element name="price" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="genre" type="xsd:string" />
    <xsd:attribute name="publicationdate" type="xsd:string" />
    <xsd:attribute name="ISBN" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="authorName">
    <xsd:sequence>
      <xsd:element name="first-name" type="xsd:string" />
      <xsd:element name="last-name" type="xsd:string" />
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>


Validating XML with an XmlReader against an XML Schema (C#)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Xml;
using System.Xml.Schema;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int bookcount = 0;
        XmlReaderSettings settings = new XmlReaderSettings();
        string booksSchemaFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xsd");
        settings.Schemas.Add(null, XmlReader.Create(booksSchemaFile));
        settings.ValidationType = ValidationType.Schema;
        settings.ValidationFlags =
        XmlSchemaValidationFlags.ReportValidationWarnings;
        settings.ValidationEventHandler += new ValidationEventHandler(settings_ValidationEventHandler);
        settings.IgnoreWhitespace = true;
        settings.IgnoreComments = true;
        string booksFile = Path.rubine(Request.PhysicalApplicationPath, "Data.xml");
        using (XmlReader reader = XmlReader.Create(booksFile, settings))
        {
            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element && "book" == reader.LocalName)
                {
                    bookcount++;
                }
            }
        }
        Response.Write(String.Format("Found {0} books!", bookcount));
    }
    void settings_ValidationEventHandler(object sender, System.Xml.Schema.ValidationEventArgs e)
    {
        Response.Write(e.Message);
    }
}
File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.ru" xmlns="http://example.books.ru" targetNamespace="http://example.books.ru" elementFormDefault="qualified">
  <xsd:element name="bookstore" type="bookstoreType" />
  <xsd:complexType name="bookstoreType">
    <xsd:sequence maxOccurs="unbounded">
      <xsd:element name="book" type="bookType" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="bookType">
    <xsd:sequence>
      <xsd:element name="title" type="xsd:string" />
      <xsd:element name="author" type="authorName" />
      <xsd:element name="price" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="genre" type="xsd:string" />
    <xsd:attribute name="publicationdate" type="xsd:string" />
    <xsd:attribute name="ISBN" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="authorName">
    <xsd:sequence>
      <xsd:element name="first-name" type="xsd:string" />
      <xsd:element name="last-name" type="xsd:string" />
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>


Validating XML with an XmlReader against an XML Schema (VB)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
File: Default.aspx.vb
Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
           Handles Me.Load
        Dim bookcount As Integer = 0
        Dim settings As New XmlReaderSettings()
        Dim booksSchemaFile As String = Path.rubine(Request.PhysicalApplicationPath, "Data.xsd")
        settings.Schemas.Add(Nothing, XmlReader.Create(booksSchemaFile))
        settings.ValidationType = ValidationType.Schema
        settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings
        AddHandler settings.ValidationEventHandler, _
        AddressOf settings_ValidationEventHandler
        settings.IgnoreWhitespace = True
        settings.IgnoreComments = True
        Dim booksFile As String = Path.rubine(Request.PhysicalApplicationPath, "Data.xml")
        Using reader As XmlReader = XmlReader.Create(booksFile, settings)
            While (reader.Read())
                If (reader.NodeType = XmlNodeType.Element And "book" = reader.LocalName) Then
                    bookcount += 1
                End If
            End While
        End Using
        Response.Write(String.Format("Found {0} books!", bookcount))
    End Sub
    Sub settings_ValidationEventHandler(ByVal sender As Object, _
            ByVal e As System.Xml.Schema.ValidationEventArgs)
        Response.Write(e.Message)
    End Sub

End Class

File: Data.xml
<?xml version="1.0"?>
<bookstore xmlns="http://example.books.ru"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book genre="A" 
          publicationdate="1981" 
          ISBN="1-11111-11-0">
        <title>title 1</title>
        <author>
            <first-name>A</first-name>
            <last-name>B</last-name>
        </author>
        <price>8</price>
    </book>
    <book genre="B" 
          publicationdate="1999" 
          ISBN="0-222-22222-2">
        <title>title 2</title>
        <author>
            <first-name>C</first-name>
            <last-name>D</last-name>
        </author>
        <price>11.99</price>
    </book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.ru" xmlns="http://example.books.ru" targetNamespace="http://example.books.ru" elementFormDefault="qualified">
  <xsd:element name="bookstore" type="bookstoreType" />
  <xsd:complexType name="bookstoreType">
    <xsd:sequence maxOccurs="unbounded">
      <xsd:element name="book" type="bookType" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:complexType name="bookType">
    <xsd:sequence>
      <xsd:element name="title" type="xsd:string" />
      <xsd:element name="author" type="authorName" />
      <xsd:element name="price" type="xsd:decimal" />
    </xsd:sequence>
    <xsd:attribute name="genre" type="xsd:string" />
    <xsd:attribute name="publicationdate" type="xsd:string" />
    <xsd:attribute name="ISBN" type="xsd:string" />
  </xsd:complexType>
  <xsd:complexType name="authorName">
    <xsd:sequence>
      <xsd:element name="first-name" type="xsd:string" />
      <xsd:element name="last-name" type="xsd:string" />
    </xsd:sequence>
  </xsd:complexType>
</xsd:schema>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/XML/XmlReader&oldid=2968»