Why is the code missing in ms vs express 2013?

Question

C++ / C#

An "empty project" was created, written and successfully compiled, saved. The next time you open the project, it was not possible to open the source. Writes " there is no editor available for ". When opened with notepad, it's empty. Why could this happen and what can be done about it?

Answer 1

Use version control systems.
For example, git.