LINQ defines standard query operators that allow code written in LINQ-enabled languages to filter, enumerate, and create projections of several types of collections using the same syntax. Such collections may include arrays, enumerable classes, XML, datasets from relational databases, and third party data sources. The LINQ project uses features of version 2.0 of the .NET Framework, new LINQ-related assemblies, and extensions to the C# and Visual Basic .NET languages. Microsoft has distributed a preview release of LINQ, consisting of those libraries and compilers for C# 3.0 and Visual Basic 9. Other languages, such as F# and Nemerle, have also announced preliminary support.

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An object that can transform the header or content (or both) of a request or response. Filters differ from Web components in

that they usually do not themselves create responses but rather modify or adapt the requests for a resource, and modify or

adapt responses from a resource. A filter should not have any dependencies on a Web resource for which it is acting as a

filter so that it can be composable with more than one type of Web resource.

Common dialogs are those that appear so frequently in application programs and hence the have become a part of MFC library. MFC provides the common dialogs listed below: -         CFileDialog: File Open and File Save As dialog -         CPrintDialog: Print and Print Setup dialog -         CPageSetupDialog: Page setup dialog -         CFindReplaceDialog: File and replace dialog -         CColorDialog: Color dialog box -         CFontDialog: Dialog box to change font style, color, size, etc. A common dialog is invoked by filling in the fields of the data structure and then calling the doModal() of the dialog. When the dialog returns the user input values are populated in the respective fields of the data structure.E.g. Lets say we want to show the File Open dialog box. TCHAR filter [] = _T ("Text files (*.txt)|*.txt||"); //Specify a filer for the file type CFileDialog dlg(TRUE, _T("txt"), _T("*.txt"), OFN_FILEMUSTEXIST, filter);  If(dlg.doModal() == IDOK){//Get the user selected file namefilename = dlg.GetFileName();}

In Circumstances, all of the data for a row in a table may not be able to fit in the same data block. When this occurs, the data for the row is stored in a chain of data block (one or more) reserved for that segment.