This sample shows how to build an Excel add-in using .NET Blazor technologies. Blazor Webassembly allows you to build Office Add-ins using .NET, C#, and JavaScript to interact with the Office JS API.

Learn how to build the simplest Office Add-in with only a manifest, HTML web page, and a logo. This sample will help you understand the fundamental parts of an Office Add-in. Display hello world in ...

To add an add-in to Excel, open Excel, click on the File tab, and select Get Add-ins category. Select the desired add-in from the Add-Ins available and click Add . The add-in will be installed.

Microsoft is opening up Excel to developers with a new JavaScript API. It will let developers use custom data types like images, cards, and arrays.

Enabling JavaScript should make Excel more powerful, but increasing access points makes it even more of a web security nightmare than it already is.

Retrieving up to date stock market prices for Excel is a snap with the free Stock Connector add-in. Here's a walkthrough of how you get it and how it works.