Skybrud.Social.Basecamp is an API wrapper for the Basecamp 2 API and the Basecamp 3 API, and helps you with both authentication as well as raw and object-oriented communication.
You can download this package from either NuGet (recommended) or download a ZIP file with the neccessary files from here on GitHub:
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NuGet Package
Install this NuGet package in your Visual Studio project. Makes updating easy. -
ZIP file
Grab a ZIP file of the latest release; unzip and move the files to the bin directory of your project.