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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 <Price> element shown here is part of the http://www.SuperProProducts.com/SuperProProductList namespace: <Price xmlns="http://www.SuperProProducts.com/SuperProProductList"> 49.33 </Price> If you don t take this step, the element will not be part of any namespace. It would be cumbersome if you needed to type 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 <SuperProProductList> element and all the elements it contains are placed in the http://www.SuperProProducts.com/SuperProProductList namespace: < xml version="1.0" > <SuperProProductList xmlns="http://www.SuperProProducts.com/SuperProProductList"> <Product> <ID>1</ID> <Name>Chair</Name> <Price>49.33</Price> <Available>True</Available> <Status>3</Status> </Product> <!-- Other products omitted. --> </SuperProProductList> In compound documents, you ll have markup from more than one XML language, and you ll need to place different sections into different namespaces. In this situation, you can use namespace prefixes to sort out the different namespaces. 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 the SuperProProductList document rewritten to use the prefix super: < xml version="1.0" > <super:SuperProProductList xmlns:super="http://www.SuperProProducts.com/SuperProProductList"> <super:Product> <super:ID>1</super:ID> <super:Name>Chair</super:Name> <super:Price>49.33</super:Price> <super:Available>True</super:Available> <super:Status>3</super:Status>

</super:Product> <!-- Other products omitted. --> </super:SuperProProductList> 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 throughout the document. By convention, the attributes that define XML namespace prefixes are usually added to the root element of an XML document. Although the xmlns attribute looks like an ordinary XML attribute, it isn t. The XML parser interprets it as a namespace declaration. (The reason XML namespaces use XML attributes is a historical one. This design ensured that old XML parsers that didn t understand namespaces could still read newer XML documents that use them.)

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Select Case extension.ToLower() Case ".bmp", ".gif", ".jpg" ' This is an allowed file type. Case Else lblInfo.Text = "This file type is not allowed." Return End Select ' Using this code, the saved file will retain its original ' file name when it's placed on the server. Dim serverFileName As String = _ Path.GetFileName(Uploader.PostedFile.FileName) Dim fullUploadPath As String = _ Path.Combine(uploadDirectory, serverFileName) Try Uploader.PostedFile.SaveAs(fullUploadPath) lblInfo.Text = "File " & serverFileName lblInfo.Text &= " uploaded successfully to " lblInfo.Text &= fullUploadPath Catch Err As Exception lblInfo.Text = err.Message End Try End If End Sub End Class

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Note Attributes act a little differently than elements when it comes to namespaces. You can use namespace

The saved file keeps its original (client-side) name. The code uses the Path.GetFileName() shared method to transform the fully qualified name provided by FileUpload.PostedFile.FileName and retrieve just the file, without the path. The FileUpload.PostedFile object contains only a few properties. One interesting property is ContentLength, which returns the size of the file in bytes. You could examine this setting and use it to prevent a user from uploading excessively large files.

prefixes with both elements and attributes. However, attributes don t pay any attention to the default namespace of a document. That means if you don t add a namespace prefix to an attribute, the attribute will not be placed in the default namespace. Instead, it will have no namespace.

By default, ASP.NET will reject a request that s larger than 4MB. However, you can alter this maximum by modifying the maxRequestLength setting in the web.config file. This sets the largest allowed file in kilobytes. The web server will refuse to process larger requests. The following sample setting configures the server to accept files up to 8MB: < xml version="1.0" encoding="utf-8" > <configuration> <system.web> <!-- Other settings omitted for clarity. --> <httpRuntime maxRequestLength="8192" /> </system.web> </configuration> Be careful, though. When you allow an 8MB upload, your code won t run until that full request has been received. This means a malicious server could cripple your server by sending large request messages to your application. Even if your application ultimately rejects these messages, the ASP.NET worker process threads will still be tied up waiting for the requests to complete. This type of attack is called a denial-of-service attack, and the larger your allowed request size is, the more susceptible your website becomes.

You can use the XmlTextWriter and XDocument classes you ve already learned about to create XML content that uses a namespace. The XmlTextWriter includes an overloaded version of the WriteStartElement() method that accepts a namespace URI. Here s how it works: string ns = "http://www.SuperProProducts.com/SuperProProductList"; w.WriteStartDocument(); w.WriteStartElement("SuperProProductList", ns); ' Write the first product. w.WriteStartElement("Product" , ns) ... The only trick is remembering to use the namespace for every element. The XDocument class deals with namespaces using a similar approach. First, you define an XNamespace object. Then, you add this XNamespace object to the beginning of the element name every time you create an XElement (or an XAttribute) that you want to place in that namespace. Here s an example: XNamespace ns = "http://www.SuperProProducts.com/SuperProProductList"; XDocument doc = new XDocument( new XDeclaration("1.0", null, "yes"), new XComment("Created with the XDocument class."), new XElement(ns + "SuperProProductList", new XElement(ns + "Product", new XAttribute("ID", 1), new XAttribute("Name", "Chair"),

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