I have a project PROJECT_A which contains mdf file database. In the solution of this project I added one new project - PROJECT_B.
My question is:Can I use .mdf file from PROJECT_A in PROJECT_B?
You can add .mdf file as a Link Reference to project B
Right click project B and then properties > Add Reference > Existing Item > Select the .mdf file and in the add button select Add As Link
option.