A solution is a group of one or more projects and associated items. Each time you work in the Integrated Development Environment you are working with a solution; each instance of the IDE can contain only one solution. The current solution is represented by the top-level node in the Project Explorer window.
Information about the projects and items that make up a solution is contained in a solution (.sln) file.
To open a new solution
To save the current solution
Note The specific types of projects, files, or items that a solution can contain may vary depending on the language engine. See language specific documentation for more information.