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Description Incoming values are written as the current and original values for each column in the row. Incoming values are written as the original values of the row. Current values are not touched. Incoming values are written as the current values of the row. Original values are not touched.

ipAddress is the numerical IP address of the host or network being allowed or denied access. For instance, 127.0.0.1 would represent the localhost. If you are denying access by default (setting allowUnlisted to false), you will generally want to enable access by 127.0.0.1 and other locally bound IP addresses for testing. subnetMask is the numerical subnet mask that defines which network is being referenced by IP address. For instance, to cut off the entire 10.*.*.* network, you would use an ipAddress of 10.0.0.0 and a subnetMask of 255.0.0.0. The default value is 255.255.255.255, which masks to a single IP address. domainName is a fully qualified domain name of a host that this rule should apply to. allowed will when set to true allow all clients that match the rule given, and when set to false will deny all clients that match the rule. The rules are processed in order from first to last, and the first match dictates what is done with the incoming connection.

The user interface for this setting is simple, and distinguishes between setting an Allow entry and setting a Deny entry. In Figure 16-3, I have chosen to add an Allow entry for the network 169.254.*.* (which you may see expressed elsewhere as 169.254.0.0/16).

When the Load method is called on a DataTable, it fills the current object with incoming values. If the DataTable already contains rows, the data from the source is merged with the existing rows. The prototypes are shown here:

try { SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser parser = factory.newSAXParser(); Obtains a SAXParser via JAXP File ourExample = new File("product-catalog.xml"); parser.parse( ourExample, handler); } catch (Exception e) { System.out.println(e.getMessage()); } } }

Figure 16-3 The Add Allow Restriction Rule dialog box to allow 169.254.*.*.

public void Load(IDataReader) public void Load(IDataReader, LoadOption)

Part III:

When the code in listing 2.6 is executed against our product catalog document from listing 2.1, you should see the following output:

In ADO.NET 1.x, the DataTable class supports runtime object serialization through the .NET formatter classes, but not any form of XML serialization. The DataSet object, for example, has ReadXml and WriteXml methods that allow you to save to and restore from an XML stream. Serializing the DataTable to XML is not hard you just create a temporary DataSet, copy the DataTable to it, and serialize the DataSet. The same functionality is now natively exposed from the same DataTable class.

As you can see in Figure 16-4, this is now listed as an allow entry. There is no way, other than removing and re-adding, to turn an Allow entry into a Deny entry.

The corresponding XML code in the applicationHost.config file looks like this:

The WriteXml method comes with a long list of overloads. You can write the contents of a DataTable to a stream, file, XML writer, or text writer. Using the WriteXml method, you can write data only or both data and schema to an XML document. You can control the output format by setting the XmlWriteMode parameter:

<configuration> ... <location path="Default Web Site"> <system.webServer> <security> <ipSecurity enableReverseDns="false"> <add ipAddress="169.254.0.0" subnetMask="255.255.0.0" allowed="true"/> </ipSecurity> </security> </system.webServer> </location> </configuration>

This statement only prints once, since we have only defined a single product. If there were multiple products defined, this statement would have printed once per product.

public void WriteXml(String) public void WriteXml(String, XmlWriteMode)

By default, HTTP runs over port 80, but because URLs can embed the port number, it is common to find that a Web server is working on ports other than port 80. The HTTPS protocol, HTTP over SSL/TLS, is bound to port 443 by default. From a security perspective, this use of ports can be useful to restrict access at the firewall. If a server has been configured to listen for incoming requests at port 8080, and is hosting

Acceptable values for the XmlWriteMode parameter are WriteSchema, IgnoreSchema (the default), and DiffGram. The first two options serialize the DataTable with or without schema. The last one uses the DiffGram XML format. When the default XML format is used, WriteXml generates the following markup:

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