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As you can see, several methods have to do with XPath expressions that are often rendered as instances of the XPathExpression class. But why do we need to express an XPath command using a new class XPath Expressions in the .NET Framework An XPath expression is first of all a string that represents a location path, but an XPath expression is a bit more than a plain command string. It has a surrounding context that is just what the .NET Framework XPathExpression class encapsulates. The context of an expression includes the return type and the namespace information to handle the involved nodes. The XPathExpression Class Table 6-7 lists the methods and properties that characterize a .NET Framework XPath expression. Table 6-7: Properties and Methods of the XPathExpression Class Name Description Expression Property that returns the XPath expression as a string. ReturnType AddSort Clone SetContext Property that returns the computed result type of the expression. Method that sorts the nodes selected by the expression. Method that clones the XPathExpression object. Method that sets the necessary information to use for resolving nodes namespaces. The information is passed, packed into an object of type XmlNamespaceManager.

You want to create a new web service that will expose multiple methods that are meant to work with user-specific data via a transaction. You decide to use ASP.NET session state to manage the user s context on the server between web service requests. How should you define your web service

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SELECT shipperid FROM dbo.Orders GROUP BY shipperid HAVING MAX(orderdate) < '20040101';

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The CompareValidator control performs validation by using comparison operators such as greater than and less than to compare the data entered by a user with a constant you set or a value in a different control.

The central concept in relational data structures is the table or relation (from which the relational model derives its name). A table is defined as a set of rows, or tuples. The rows of a table share the same set of attributes; a row consists of a set of (attribute name; attribute value) pairs. All data in a relational database is represented as column values within table rows. In summary, the basic relational data structures are as follows: A database, which is a set of tables A table, which is a set of rows A row, which is a set of column values

In this code, I m comparing apples and oranges. OK, I m really comparing Some ValueTypes and Objects, but you see that this code doesn t make a lot of sense because Object doesn t have an x field. The compiler can t detect the flaw in the logic, however, and it produces code no warnings or errors are generated. But at run time, when CompareTo is called, an InvalidCastException is thrown when other is cast to SomeValueType. As always, developers prefer compile time errors to run time errors, and the CLR offers a feature called explicit interface member implementations that makes compile time type checking possible. 268

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In this practice, you create a domain user account and a corresponding remote access policy. You then dial in with the user account to test the configuration.

4 De-select the series selection (by pressing esc or clicking on a free space in the chart) Only the chart area is now selected (the editing frame is displayed ) Resize the object using the Chart Tools/Format/Size command to dimensions of approximately 4 inches x 7 inches and move it to the top left corner so that it is placed near or in cell F2 5 Select it in the legend and delete it by pressing the Del key 6 Select the plot area and resize it to dimensions of approximately 3 inches x 5 inches using the mouse (unfortunately, you can t use the command listed in number 4) Use the specifications of the adjacent worksheet for the size and position of the plot area 7 Select the columns again .

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The XML source represents a hierarchy of nodes that the XmlTextReader retrieves sequentially. Progress through the XML is analogous to the use of a cursor that moves through the XML nodes. The node currently under the cursor is the current node. The XmlTextReader exposes information about the current node through the properties of the XmlTextReader instance, although not all properties apply to all node types.