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RequestPhysicalApplicationPath) End If Return strFileList End Get End Property This example uses the file access classes described in 13 to retrieve a list of files in the web application This approach wouldn t be possible with the Application collection The other benefit of using Shared member variables is that the code that consumes them can be type-safe Here s an example that uses the FileList property: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Dim builder As New StringBuilder() For Each file As String In GlobalFileList builderAppend(file & "<br />") Next lblInfoText = builderToString() End Sub Notice that no casting step is required to gain access to the custom property you ve added..

What if you want to create an XmlDocument and fill it based on XML content you ve drawn from another source, such as a field in a database table In this case, instead of using the Load() method, you would use LoadXml(), which accepts a string that contains the content of the XML document.

GetXml() WriteXml()

An XML fragment contains valid XML syntax, but isn t necessarily a valid document of its own. Usually, this is because there is no root element. An XML document requires all elements to be nested in a single root element.

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The interesting part is the GetChildNodesDescr() method. It first creates a string with three spaces for each indentation level that it will later use as a prefix for each line added to the final HTML text. private string GetChildNodesDescr(XmlNodeList nodeList, int level) { string indent = ""; for (int i=0; i<level; i++) indent += "     "; ... Next, the GetChildNodesDescr() method cycles through all the child nodes of the XmlNodeList. For the first call, these nodes include the XML declaration, the comment, and the <DvdList> element. An XmlNode object exposes properties such as NodeType, which identifies the type of item (for example, Comment, Element, Attribute, CDATA, Text, EndElement, Name, and Value). The code checks for node types that are relevant in this example and adds that information to the string, as shown here: ... StringBuilder str = new StringBuilder(""); foreach (XmlNode node in nodeList) { switch(node.NodeType) { case XmlNodeType.XmlDeclaration: str.Append("XML Declaration: <b>");

str.Append(node.Name); str.Append(" "); str.Append(node.Value); str.Append("</b><br />"); break; case XmlNodeType.Element: str.Append(indent); str.Append("Element: <b>"); str.Append(node.Name); str.Append("</b><br />"); break; case XmlNodeType.Text: str.Append(indent); str.Append(" - Value: <b>"); str.Append(node.Value); str.Append("</b><br />"); break; case XmlNodeType.Comment: str.Append(indent); str.Append("Comment: <b>"); str.Append(node.Value); str.Append("</b><br />"); break; } ... Note that not all types of nodes have a name or a value. For example, for an element such as Title, the name is Title, but the value is empty, because it s stored in the following Text node. Next, the code checks whether the current node has any attributes (by testing if its Attributes collection is null). If it does, the attributes are processed with a nested foreach loop: ... if (node.Attributes != null) { foreach (XmlAttribute attrib in node.Attributes) { str.Append(indent); str.Append(" - Attribute: <b>"); str.Append(attrib.Name); str.Append("</b> Value: <b>"); str.Append(attrib.Value); str.Append("</b><br />"); } } ... Lastly, if the node has child nodes (according to its HasChildNodes property), the code recursively calls the GetChildNodesDescr function, passing to it the current node s ChildNodes collection and the current indent level plus 1, as shown here: ... if (node.HasChildNodes) str.Append(GetChildNodesDescr(node.ChildNodes, level+1)); } return str.ToString(); } When the whole process is finished, the outer foreach block is closed, and the function returns the content of the StringBuilder object.

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.

The FOR XML clause supports a specialized syntax that allows you to specify the exact structure and naming of the resulting document. However, this syntax doesn t conform to any XML standard, and it s notoriously messy. As a result, XML queries often use one of the two default XML representations that SQL Server provides. The first is FOR XML AUTO. For example, if you execute this query: SELECT FirstName, LastName FROM Employees FOR XML AUTO

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