the small blue arrow on the file in the Visual Studio solution explorer view means that the file is a link. That is, the file doesn’t belong to the C# project, but is referenced from somewhere else.
To create a link: right-click on the project, choose Add/Add Existing, browse to the file, then click the DOWN ARROW NEXT TO the Add button. There you can choose “Add as link”. Yes, this is one of Visual Studio’s best kept secrets.
Once you have added the file, open its file properties and make sure that the Build Action is set to Content and Copy to Output Directory is set to Copy if newer. This is actually the critical part; it doesn’t really matter if you add the file as a link or not.
If at run time: this can happen if you build your app for “Any CPU” and then run it on a 64-bit OS while referencing the 32-bit Tobii.EyeX.Client.Net20.dll.
Always build for x86 or x64 and reference the appropriate client dll.
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Are you planning to make your eye Tracker enabled application/game available to many people? We hope so, and for this reason, we have done our best to make it easy for you to distribute your applications and games built using the Tobii SDKs.
When you download a Tobii SDK you agree to an SDK License Agreement that (with a few exceptions) allows you distribute the Tobii client library files necessary to add eye tracking to your application. One limitation is that you may only use the Tobii Core SDK to develop interactive applications. If you want to develop software for analytical purposes, post processing or aggregation of eye tracking data across multiple users, please Contact Tobii Pro. Also, you may not use the SDK to develop software that is used in so-called high-risk use applications.
We at Tobii also want to do our best to help you reach as many people as possible with your application, and help you to commercialize it if that is your goal. Contact us if you want to know more about what the opportunities will be for you during the current year, and how we expect the market for eye tracking in consumer electronics to evolve.