How to customize ASP.NET Identity Core Username to allow special characters and space

Question

I have changed my Register Action Method to accept user Name instead of Email.

if (ModelState.IsValid)
{
    var user = new ApplicationUser          


        

Answer 1

UserName should not allow special characters or white spaces, I don't think that there is any website will allow you to do that, you can use FirstName and Last name to get an info like "Joe Smith".