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The XML source is read one node after the next until the end is reached The information read is transformed into a DataRow object that is added to a DataTable object Of course, the layout of both the DataTable object and the DataRow object is determined based on the schema read or inferred Merging DataSet Objects When loading the contents of XML sources into a DataSet object, the ReadXml method does not merge new and existing rows whose primary key information matches To merge an existing DataSet object with a DataSet object just loaded from an XML source, you must proceed in a particular way First you create a new DataSet object and fill it with the XML data Next you merge the two objects by calling the Merge method on either object, as shown in the following code.

Connection model Both readers and navigators work on top of a data source Readers, however, work connected to the input stream, which is often a persistent storage medium like a disk file Navigators always work on memory-mapped data sources like XML DOM or more optimized and specialized structures Readers must be closed when you have finished with them; navigators are simply garbage-collected when they go out of scope A parallel can be drawn with ADONET data readers and DataSet objects An XML data reader object, like the SqlDataReader base class, is connected to the data source, whereas a DataSet object is a disconnected object Navigation interface Readers are simple read-only and forward-only cursors Navigators too are read-only, but they let you move forward and backward The navigator's set of move methods is significantly richer.

The Merge method is used to merge two DataSet objects that have largely similar schemas targetMerge(source); The target DataSet object is the object on which the merge occurs The source DataSet object provides the information to merge but is not affected by the operation Determining which DataSet object must be the target and which will be the source is up to you and depends on the data your application needs to obtain During the merging, the rows that get overwritten are those with matching primary keys An alternative way to merge existing DataSet objects with contents read from XML is through the DiffGram format Loading a DiffGram using ReadXml will automatically merge rows that have matching primary keys When using the XmlReadModeDiffGram format, the target DataSet object must have the same schema as the DiffGram; otherwise, the merge operation fails and an exception is thrown.

In particular, the set includes methods for going to the root of the underlying document, for reaching the parent node, for reaching the next and the previous sibling, for reaching the node where the given namespace is defined, and even more In addition, you can synchronize the navigator position with the current position on another navigator object Programming interface Navigators provide rich XPath capabilities and supply methods that perform XPath queries and return groups of related nodes You have a generic Select method but also ad hoc selection methods that specialize on the most common XPath axes, such as descendant, ancestor, and child In addition, navigators can simply evaluate an XPath expression and return the value Conceptually, XPath navigators and XML readers occupy diametrically opposed positions in the NET XML puzzle Moreover, this difference clearly stems from their names Navigators are thought to traverse XML-based or XMLlooking data.

Reading Schema Information The XmlReadModeIgnoreSchema option causes the ReadXml method to ignore any referenced or in-line schema The data is loaded into the existing DataSet schema, and any data that does not fit is discarded If no schema exists in the DataSet object, no data will be loaded Of course, an empty DataSet object has no schema information, as shown in the following listing If the XML source is in the DiffGram format, the IgnoreSchema option has the same effect as XmlReadModeDiffGram // No schema in the DataSet, no data will be loaded DataSet ds = new DataSet(); StreamReader sr = new StreamReader(fileName); dsReadXml(sr, XmlReadModeIgnoreSchema); Reading In-Line Schemas The XmlReadModeReadSchema option works only with in-line schemas and does not recognize external references to schema files.

When you display the History tab, the relevant portion of the Event Viewer snap-in snaps in, showing you all the recent events relating to the selected task. This is exactly what you would see if you ran Evntvwr.msc, navigated in the Console Tree to Applications And Services Logs\Microsoft\Windows\TaskScheduler\Operational, and filtered the resulting log display to show events relating to the selected task. (Obviously, if you want this information, it s quicker to find it in the Task Scheduler console than in the Event Viewer console.) If a task you ve set up is not getting triggered when you expect it to or not running successfully when it should, you can double-click the appropriate event entry and read whatever details the event log has to offer.