Create user in asp.net c# identity doesn't work with Hebrew user name

I am using asp.net Identity for authorization and authentication. I tried creating a user name with Hebrew letters but it didn't work.

With the old Membership I was able to use Hebrew characters for user names. Is it possible with Identity to use non-Latin characters?

I think you can attempt to do something like this:

Create a new Custom user validator to do your own custom validation( You can use a regex as well for validations):

public class CustomUserValidator<TUser> : IIdentityValidator<TUser>
    where TUser : class, Microsoft.AspNet.Identity.IUser
{
    public CustomUserValidator(UserManager<TUser> manager)
    {
        _manager = manager;
    }

    public async Task<IdentityResult> ValidateAsync(TUser item)
    {
        // Your custom validation here
    }
}

and then when you are creating your application user manager you can set the Default user validator to an instance of this new validator class:

manager.UserValidator = new CustomUserValidator<ApplicationUser>(manager)
{
    AllowOnlyAlphanumericUserNames = false,
    RequireUniqueEmail = true
};

[NOTE:] default validator is like:

manager.UserValidator = new UserValidator<ApplicationUser>(manager)
    {
        AllowOnlyAlphanumericUserNames = false,
    };