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When you create a new VSTO Add-in project for Excel, Visual Studio automatically creates a ThisAddIn.vb or ThisAddIn.cs code file. For resources where you can learn more about the entire Excel object model, see Use the Excel object model documentation. This topic provides a brief overview of the Excel object model. For more information, see Automate Excel by using extended objects and Host items and host controls overview. Host items and host controls behave like the Excel objects they extend, but they also have additional functionality such as data-binding capabilities and extra events.

In addition to the Excel object model, Office projects in Visual Studio provide host items and host controls that extend some objects in the Excel object model. From there, the major abstraction that represents cells is the Range object, which enables you to work with individual cells or groups of cells. The Application object represents the entire application, and each Workbook object contains a collection of Worksheet objects. The object model closely follows the user interface. Office Add-ins have a small footprint compared to VSTO Add-ins and solutions, and you can build them by using almost any web programming technology, such as HTML5, JavaScript, CSS3, and XML.

Interested in developing solutions that extend the Office experience across multiple platforms? Check out the new Office Add-ins model.

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