Answer / swapna

AspCompat is an aid in migrating ASP pages to ASPX pages.
It defaults to false but should be set to true in any ASPX
file that creates apartment-threaded COM objects--that is,
COM objects registered ThreadingModel=Apartment.

That includes all COM objects written with Visual Basic
6.0. AspCompat should also be set to true (regardless of
threading model) if the page creates COM objects that
access intrinsic ASP objects such as Request and Response.
The following directive sets AspCompat to true:


<%@ Page AspCompat="true" %>
Setting AspCompat to true does two things. First, it makes
intrinsic ASP objects available to the COM components
by placing unmanaged wrappers around the equivalent ASP.NET
objects.

Second, it improves the performance of calls that the page
places to apartment- threaded COM objects by ensuring that
the page (actually, the thread that processes the request
for the page) and the COM objects it creates share an
apartment.

AspCompat="true" forces ASP.NET request threads into single-
threaded apartments (STAs). If those threads create COM
objects marked ThreadingModel=Apartment, then the objects
are created in the same STAs as the threads that created
them. Without AspCompat="true," request threads run in a
multithreaded apartment (MTA) and each call to an STA-based
COM object incurs a performance hit when it's marshaled
across apartment boundaries.

Do not set AspCompat to true if your page uses no COM
objects or if it uses COM objects that don't access ASP
intrinsic objects and that are registered
ThreadingModel=Free or ThreadingModel=Both.

You are creating a Web site for Your company. You receive product lists in the form of XML documents. You are creating a procedure to extract information from these XML documents according to criteria that your users will select. When a user makes a request, you want the results of these requests to be returned as quickly as possible. What should you do? A . Create an XmlDataDocument object and load it with the XML dat Use the DataSet property of the object to create a DataSet object. Use a SQL SELECT statement to extract the requested dat B . Create an XmlDataDocument object and load it with the XML data. Use the SelectNodes method of the object to extract the requested data. C . Create an XPathDocument object and load it with the XML data. Call the CreateNavigator method to create an XPathNavigator object. Call the Select method of the XPathNavigator object to run an XPath query that extracts the requested data. D . Create an XmlReader object. Use the Read method of the object to stream through the XML data and to apply an XPath expression to extract the requested data.

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