Microsoft Visual Studio is a contextual based development environment, meaning that the current item selected determines the available features in the development environment. Controlling which changed files you save or how you want to save them is determined by the Solution Explorer.
Once a project or solution is selected from the Solution Explorer, you can save it with its current name, or perform a Save As on it to create a copy of the file. You can select one or more items at a time in the Solution Explorer by pressing and holding the Ctrl key before selecting an item. Most often, you will be saving all changed items at the same time.
To save a project or solution
If you choose Save <project or solution name> As, the Save File As dialog box is displayed.
To save all changed items