I addded Data annotations in my class model, but it was not showing online, only offline.
[DisplayName("Last Name")]
public string Name { get; set; }
After some research I realised I was not doing anything wrong.
So, I decided to upload the whole site, instead of only the class file. And it worked out.
Than I found that I needed to upload the files in the bin directory. This was sufficient after a change to the dara annotations in a class model.
So my problem is already solved. I was not syntax related, nor was the class incorrect.
Why is that? Why do I need to update the bin directory?