To save a project, choose Save All from the File menu
To open the project, double click the project .vbproj or the solution .sln file
A solution can contain many projects. If you are working on a project that uses a DLL you wrote, and that DLL has been added as a project, rather than a compiled DLL, you need to open the solution. For solutions containing only one project, the project and solution file are analogous
To open a form, double click it in the solution explorer. To view the code, right click it and choose view code