1. VSTO Visual Studio Tools For Office

2. 'Copyright (c)TEE Ernst & Young. All rights reserved. Why to Use VSTO VSTO enable developers to put Windows Forms controls on the document surface. Maybe you are going to use an Excel spreadsheet as a front end to corporate data. many stockbrokers use Excel as their primary input and display mechanism when trading. In this scenario, the spreadsheet is very rarely e-mailed or printed Putting a Windows Forms button control on the surface of the document meets the requirement of making the spreadsheet more interactive and provides obvious actions that are available to the user of the spreadsheet

3. 'Copyright (c)TEE Ernst & Young. All rights reserved. Why so fuss about VSTO VSTO is basically a Visual Studio add in. Advantages: Protects users with better security. Protects codes by hiding it from view. Improves the way you deploy new code and future updates to users..Net like programming in Word and Excel.

4. 'Copyright (c)TEE Ernst & Young. All rights reserved. Where does new code going to reside Not with the Excel or document like VBA but with a separate dll file.

5. 'Copyright (c)TEE Ernst & Young. All rights reserved. Examples: 1.Open a new document 2.Open an existing Excel file.