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The .NET Framework provides two approaches for writing XML data to a file: You can use DOM techniques to build the document in memory using the XmlDocument class and write it to a file when you re finished by calling the Save() method. The XmlDocument represents XML using a tree of node objects. You can write the document directly to a stream using the XmlTextWriter. This outputs data as you write it, node by node. The XmlDocument is a good choice if you need to perform other operations on XML content after you create it, such as searching it, transforming it, or validating it. It s also the only way to write an XML document in a nonlinear way, because it allows you to insert new nodes anywhere. However, the XmlTextWriter provides a much simpler and better performing model for writing directly to a file, because it doesn t store the whole document in memory at once.

To specify that an element belongs to a specific namespace, you simply need to add the xmlns attribute to the start tag and indicate the namespace. For example, the element shown here is part of the http://mycompany/OrderML namespace. If you don t take this step, the element will not be part of any namespace. <order xmlns="http://mycompany/OrderML"></order> It would be cumbersome if you needed to type in the full namespace URI every time you wrote an element in an XML document. Fortunately, when you assign a namespace in this fashion, it becomes the default namespace for all child elements. For example, in the XML document shown here, the <order> and <orderItem> elements are both placed in the http://mycompany/OrderML namespace: < xml version="1.0" > <order xmlns="http://mycompany/OrderML"> <orderItem>...</orderItem> <orderItem>...</orderItem> </order>

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ASP .NET also allows you to write a callback method that will be triggered when an item is removed from the cache. This might be useful if you need to clean up other related resources (such as a temporary file on the hard drive). However, you shouldn t use this callback to re-create the item and reinsert the removed item into the cache. Not only will this waste time generating data that might not be immediately required, but it will also thwart ASP.NET s attempt to reduce memory usage when server resources are scarce. You can place the method that handles the callback in your web-page class, or you can use a static method in another accessible class. However, you should keep in mind that this code won t be executed as part of a web request. That means you can t interact with web-page objects or notify the user. The following example uses a cache callback to make two interdependent items a feat that wouldn t be possible with dependencies alone. Two items are inserted in the cache, and when either one of those items is removed, the item removed callback removes the other.

You can use both the XmlDocument and the XmlTextWriter to create XML data that isn t stored in a file. Both of these classes allow you to write information to any stream, and the XmlDocument allows you to retrieve the raw XML as string data. Using techniques such as these, you could build an XML document and then insert it into another storage location such as a text-based field in a database table.

You can declare a new namespace for separate portions of the document. The easiest way to deal with this is to use namespace prefixes. Namespace prefixes are short character sequences that you can insert in front of a tag name to indicate its namespace. You define the prefix in the xmlns attribute by inserting a colon (:) followed by the characters you want to use for the prefix. Here s an order document that uses namespace prefixes to map different elements into two different namespaces: < xml version="1.0" > <ord:order xmlns:ord="http://mycompany/OrderML" xmlns:cli="http://mycompany/ClientML"> <cli:client> <cli:firstName>...</cli:firstName> <cli:lastName>...</cli:lastName> </cli:client> <ord:orderItem>...</ord:orderItem> <ord:orderItem>...</ord:orderItem> </ord:order> Namespace prefixes are simply used to map an element to a namespace. The actual prefix you use isn t important as long as it remains consistent.

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