Use the XLL+ Wrapper Project Wizard to create the XLL wrapper project.
Creating a wrapper project
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Open an XLL+ add-in project.
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In the Project Explorer, right-click on the Solution node, and select Add/New Project....
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In the Add New Project dialog, select the Visual C#/XLL+ node in the Project Types tree, and select XLL+ Wrapper in the Templates list.
Name the project and click OK.
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In the XLL+ Wrapper Wizard, eneter your preferred names for the wrapper class and its namespace, and click OK.
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You will see that a new project, containing one C# file and two XML files, has been created and added to the solution.
The next step is to save a Model file.