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Microsoft Office is the world's dominant corporate application suite. A good portion of the business world uses Microsoft Excel, Outlook, and Word applications. Over the years, Microsoft has incorporated many extensibility features in Office applications. With Office, you can create add-ins, write macros and even access to core features of Office via Visual Basic for Applications, sometimes called VBA. The Visual Studio team is also part of this integration toolset. In version 2003, they published a special copy of Visual Studio, called Visual Studio Tools for Office.
In Visual Studio 2010, Office integration is built right in. Let me show you some of the types of applications you can build with Visual Studio. I am using my File > New menu, and I am clicking New > Project. I have to choose a language. I can choose either Visual Basic or C#. The underlying programming model for inside Office applications is Visual Basic for Applications. Up until this release of Visual Studio, programming Office applications in C# has been a frustrating experience. The object model in VBA doesn't mesh very well with the C# mechanics.
Now that C$ 4.0 is out, it's much easier to write Office automation applications. For my demos, I'm going to use Visual Basic. So I am going to open up the Visual Basic node and choose Office and then filter it down to only the Office 2010 applications. As you can see, nearly every Office product is represented in here. Some of the Office products have multiple items. For instance, Excel has an add-in, a template, and a workbook. Let's talk about the difference between a workbook and an add-in.
A workbook, when you create an Excel workbook, all of the code that you're going to write is embedded in that one document. If you open that document, you can use the code. If you open any other documents, that code is not available. When you create an add-in, you're creating an application that is independent of any document. Most of the Office applications I've seen have a separate add-in manager, and this allows the user to remove an add-in when it's no longer needed. As you can see, there is an add-in for Excel and one for Outlook, and so on.
Let me just demonstrate what you can do with an Excel Workbook. I am going to click here and then click on OK. Visual Studio asks me if I'd like to create a new document or use an existing document. I am going to use a new document. As you can see, in the designer area of Visual Studio is a copy of Excel. Anything that you can do in Excel you can do inside Visual Studio. I can add text to a cell. I can take that cell and format it. I can apply Bold text.
If I have numbers I can put the numbers in here and then add a auto-sum formula. If I choose to run the application, I can press F5 and debug the application. Here I am pressing F5. Excel is going to launch. And the important thing is I'm now debugging my code that's inside my Excel code behind. Let me show you that code behind. I am going to close Excel and then switch over to this Sheet1.vb. And then I am going to right-click on it and choose View Code.
And as you can see, it's just Visual Basic code with some event procedures here that run when the sheet starts up and other one that runs when the sheet shuts down. I can also work with Word and the other Office products. Let me show you an example of that. I am going to choose New > Project, discard my existing one, scroll down, and pick Word Add-in. Remember, add-ins are independent of any document. Now, of course, I don't have a designer because it's not part of a document.
This is typically added to the Add-in menu in your application. So if I were to run this and go look in the Add-in menu inside Word, I would see by custom add-in. I'll show you an example of that in a later movie. As you see, this movie is just a quick overview of what you can do with Office in Visual Studio. The rest of the movies in this chapter dig into each topic in more detail.
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