找不到ASP.NET C＃的类型或名称空间“ GenericPrincipal”

Question

I'm trying to follow this Role-based security tutorial.

In Global.asax, I am getting the following error:

Can anyone tell me how to solve this?

Answer 1

Add using System.Security.Principal to the top.

In Visual Studio 2015 (maybe other versions too), if you see a squiggly line, you can put the cursor over the squiggly line, and then press:

CTRL + .

and Visual Studio will show you a bunch of options to fix the issue. One option shown for the above case would be to add using System.Security.Principal and you simply select the option. And that will fix it. This is a very useful tool and every developer should be aware of it. Of course, you can add the using System.Security.Principal manually too; just by typing it.