I can't use email as Username with MVC5 Microsoft.AspNet.Identity 09 March 2014 Donovan-Brown Work (0) Problem: I want to use email as the username with Microsoft.AspNet.Identity in MVC 5 application. But when I do I get the following error: User name ... is invalid, can only contain letters or digits. Solution: In the AccountController constructor that takes a userManager as a parameter add the ... [More]