Visual Studio

If you are using Visual Studio, you need to repeat these steps to create the project

When you open Visual Studio, you will see the launch wreath, you need to click the "Create a new project" button:

After that, you need to enter "Class Library (.Net Framework)" in the search and click the "Next" button:

Once you get to the next window, you need to specify the name of the project, the folder in which the project will be created, and the version of the framework (the framework version must be 4.8 or later) and click the "Create" button