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The following is a list of all the nodes that are found, shortened to include only one product: Type: XmlDeclaration Name: xml Value: version="1.0" Attributes: 1.0 Type: Element Name: SuperProProductList Type: Comment Value: This file generated by the XmlTextWriter class. Type: Element Name: Product Attributes: 1, Chair Type: Element Name: Price Type: Text Value: 49.33 Type: EndElement Name: Price Type: EndElement Name: Product Type: EndElement Name: SuperProProductList If you use the indentation trick described earlier (in the Formatting Your XML sidebar), you ll see additional nodes that represent the bits of whitespace between elements. In a typical application, you would need to go fishing for the elements that interest you. For example, you might read information from an XML file such as SuperProProductList.xml and use it to create Product objects based on the Product class shown here: Public Class Product Private _id As Integer Private _name As String Private _price As Decimal Public Property ID() As Integer Get Return _id End Get

A surprising number of websites fall prey to relatively simple attacks in which a malicious user simply tampers with a query string argument or a bit of HTML in the rendered page In the e-commerce example, you need to.

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Set(ByVal Value As Integer) _id = Value End Set End Property Public Property Name() As String Get Return _name End Get Set(ByVal Value As String) _name = Value End Set End Property Public Property Price() As Decimal Get Return _price End Get Set(ByVal Value As Decimal) _price = Value End Set End Property End Class Nothing is particularly special about this class all it does is allow you to store three related pieces of information (price, name, and ID). Note that this class uses properties rather than public member variables, so its information can be displayed in a web page with ASP.NET data binding. A typical application might read data from an XML file and place it directly into the corresponding objects. The next example (also a part of the XmlWriterTest.aspx page) shows how you can easily create a group of Product objects based on the SuperProProductList.xml file. This example uses the generic List collection, so you ll need to import the System.Collections.Generic namespace. ' Open a stream to the file. Dim fs As New FileStream(file, FileMode.Open) Dim r As New XmlTextReader(fs) ' Create the collection of products. Dim Products As New List(Of Product)() ' Loop through the products. Do While r.Read()

make sure that a user who successfully logs in can t view another user s recent orders. Imagine you ve created a ViewOrders.aspx page that takes a query string argument named userID, like this: http://localhost/InsecureStore/ViewOrders.aspx userID=4191 This example is a security nightmare, because any user can easily modify the userID parameter by editing the URL to see another user s information. A better solution would be to design the ViewOrders.aspx page so that it gets the user ID from the currently logged-on user identity (a trick you ll learn in this chapter) and then uses that to construct the right database command.

If r.NodeType = XmlNodeType.Element And r.Name = "Product" Then Dim NewProduct As New Product() NewProduct.ID = Int32.Parse(r.GetAttribute(0)) NewProduct.Name = r.GetAttribute(1) ' Get the rest of the subelements for this product. Do Until r.NodeType = XmlNodeType.EndElement r.Read() ' Look for Price subelement. If r.Name = "Price" Then Do Until (r.NodeType = XmlNodeType.EndElement) r.Read() If r.NodeType = XmlNodeType.Text Then NewProduct.Price = Val(r.Value) End If Loop End If ' We could check for other Product nodes ' (like Available, Status, etc.) here. Loop ' Add the product to the list. Products.Add(NewProduct) End If Loop fs.Close() ' Display the retrieved document. gridResults.DataSource = Products gridResults.DataBind()

Note Another example of a security vulnerability introduced by poor coding is the ever-common SQL injection

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