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The problem here is that the FullName property never returns a trailing backslash For example, c:\temp\ becomes just c:\temp However, there s one exception the root directory c:\, which always includes a trailing backslash As a result, this seemingly logical code generates the nonsensical path c:\\testtxt and fails The proper solution is to use the SystemIOPath class, which provides Shared helper methods that perform common path manipulation tasks In this case, the Combine() method neatly solves the problem and works with any directory and file, as follows: Dim dirInfo As New DirectoryInfo("c:\") Dim file As String = "testtxt" Dim strPath As String = PathCombine(dirInfoFullName, file) Minor hiccups like this are bothersome, but they aren t serious A more significant problem is the security risk of a canonicalization error.

Now that you ve taken an exhaustive look at general-purpose XML and .NET, it s worth taking a look at a related topic the XML support that s built into ADO.NET. ADO.NET supports XML through the disconnected DataSet and DataTable objects. Both have the built-in intelligence to convert their collection rows into an XML document. You might use this functionality for several reasons. For example, you might want to share data with another application on another platform. Or you might simply use the XML format to serialize to disk so you can retrieve it later. In this case, you still use the same methods, although the actual data format isn t important. Table 12-2 lists all the XML methods of the DataSet. Table 12-2. DataSet Methods for Using XML

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Canonicalization errors are a specific type of application error that can occur when your code assumes that user-supplied values will always be in a standardized form Canonicalization errors are low-tech but quite serious, and they usually have the result of allowing a user to perform an action that should be restricted One infamous type of canonicalization error is SQL injection, whereby a user submits incorrectly formatted values to trick your application into executing a modified SQL command ( 7 covered SQL injection in detail) Other forms of canonicalization problems can occur with file paths and URLs For example, consider the following method that returns file data from a fixed document directory: Dim file As New FileInfo(ServerMapPath("Documents\" & txtBoxText)) ' (Read the file and display it in another control) This code looks simple enough.

Visual Studio does include one new IntelliSense feature XHTML (Extensible HTML) validation. You ll learn about this feature, and how to control the level of XHTML support you want, in 3.

GetXml() WriteXml()

It concatenates the user-supplied filename with the Documents path, thereby allowing the user to retrieve data from any file in this directory The problem is that filenames can be represented in multiple formats Instead of submitting a valid filename, an attacker can submit a qualified filename such as .\filename The concatenated path of WebApp\Documents\.\filename will actually retrieve a file from the parent of the Documents directory (WebApp) A similar approach will allow the user to specify any filename on the web application drive Because the web service is limited only according to the restrictions of the ASP NET worker process, the user may be allowed to download a sensitive server-side file The fix for this code is fairly easy Once again, you can use the Path class.

Outlining allows Visual Studio to collapse a subroutine, block structure, or region to a single line. It allows you to see the code that interests you, while hiding unimportant code. To collapse a portion of code, click the minus box next to the first line. Click the box again (which will now have a plus symbol) to expand it (see Figure 2-16).

Retrieves the XML representation of the data in the DataSet as a single string. Writes the contents of the DataSet to a file or a TextWriter, XmlWriter, or Stream object. You can choose a write mode that determines if change tracking information and schema information is also written to the file. Reads XML data from a file or a TextReader, XmlReader, or Stream object and uses it to populate the DataSet. Retrieves the XML schema for the DataSet XML as a single string. No data is returned. Writes just the XML schema describing the structure of the DataSet to a file or a TextWriter, XmlWriter, or Stream object. You can choose to include the schema at the beginning of the document.

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