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public class ApplicationUserManager
   : UserManager<ApplicationUser, string>
   {
       public ApplicationUserManager(IUserStore<ApplicationUser, string> store)
           : base(store)
       {
       }

       public static ApplicationUserManager Create(
           IdentityFactoryOptions<ApplicationUserManager> options,
           IOwinContext context)
       {
           var manager = new ApplicationUserManager(
               new UserStore<ApplicationUser, ApplicationRole, string,
                   ApplicationUserLogin, ApplicationUserRole,
                   ApplicationUserClaim>(context.Get<ApplicationDbContext>()));

           // Configure validation logic for usernames
           manager.UserValidator = new UserValidator<ApplicationUser>(manager)
           {
               AllowOnlyAlphanumericUserNames = false,
               RequireUniqueEmail = true
           };

           // Configure validation logic for passwords
           manager.PasswordValidator = new PasswordValidator
           {
               RequiredLength = 6,
               RequireNonLetterOrDigit = true,
               RequireDigit = true,
               RequireLowercase = true,
               RequireUppercase = true,
           };
           var dataProtectionProvider = options.DataProtectionProvider;
           if (dataProtectionProvider != null)
           {
               manager.UserTokenProvider =
                   new DataProtectorTokenProvider<ApplicationUser>(
                       dataProtectionProvider.Create("ASP.NET Identity"));
           }
           return manager;
       }
   }