c# wpf open project using button

If I understood your question,

you have multiple Projects in a solution, you need the button option to open a certain project.

you can make one project to be executed at a time and in that you can have a buttons to show the multiple project names.

When a user click on any project, you know the ".exe" files residing folder patch, if all the projects are Build and exe are available then it can execute the necessary project you required.

Note: I suggested this is for the WPF windows application.