Copy always to output directory does not work

Question

I\'ve got a simple console project where I\'m reading two Excel-files. The Excel-files are included in the project (\"add existing item\") and I\'ve marked them with \"Copy

Answer 1

I had an issue when some png files was renamed-excluded-added again to project. It seemed that VS2015 had lost tracking what to do with these files: although in VS the "Copy to output directory: Copy always" was set at the problematic files, CopyToOutputDirectory key was not present in csproj file. I had to change csproj manually from

to this:

    Always