History
IntelliSense was first introduced as a feature of a mainstream Microsoft product in 1996, with the Visual Basic 5.0 Control Creation Edition, which was essentially a publicly-available prototype for Visual Basic 5.0. Although initially the primary "test bed" for the technology was the Visual Basic IDE, IntelliSense was quickly incorporated into Visual FoxPro and Visual C++ in the Visual Studio 97 timeframe (one revision after it was first seen in Visual Basic). Because it was based on the introspection capabilities of COM, the Visual Basic versions of IntelliSense were always more robust and complete than the 5.0 and 6.0 (97 and 98 in the Visual Studio naming sequence) versions of Visual C++, which did not have the benefit of being entirely based on COM. These shortcomings (criticized by many VC++ developers since the 97 release) have been largely corrected in the .NET product lines. For example, one of the most requested capabilities missing from the pre-.NET products was support for templates, which is now fully implemented.
IntelliSense has entered a new phase of development with the unified Visual Studio.NET environment first released in 2001, augmented by the more powerful introspection and code documentation capabilities provided by the .NET framework. IntelliSense is now supported by the Visual Studio editors for C++, C#, J#, Visual Basic, XML, HTML and XSLT among others. As of Visual Studio 2005, IntelliSense is now activated by default when the user begins to type, instead of requiring marker characters (although this behavior can be turned off). The IDE has the capability of inferring a greater amount of context based on what the developer is typing, to the point that basic language constructs such as for and while are also included in the choice list.
In current versions of Visual Studio IntelliSense evaluates C code as C++, generating large numbers of spurious errors. The problem does not affect the compile process.
Other Microsoft products that incorporate IntelliSense include FrontPage, Expression Web (in code view), the Visual Basic for Applications IDEs in the Microsoft Office products, and many others. SQL Server 2008 Management Studio has autocomplete for the SQL syntax.
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