Identity in .netCore RazorProject

add

 services.AddDbContext<SnContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"))
            );

to get Connectio string

rewrite appsettings.json -add connectionsstrinf- 

 be careful about "s" end of ConnectionString 

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=123.123.123.123;Database=saas;Integrated Security=false;Initial Catalog=saas;User ID=****;Password=C***;"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

add this code to configur Identity

   services.AddRazorPages();

            services.AddIdentity<ApplicationUser, IdentityRole>(options =>
            {
                options.Password.RequireDigit = true;
                options.Password.RequireLowercase = true;
                options.Password.RequireUppercase = true;
                options.Password.RequiredLength = 6;
                options.Password.RequireNonAlphanumeric = false;
                options.Password.RequiredUniqueChars = 6;

                // Lockout settings.
                options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(5);
                options.Lockout.MaxFailedAccessAttempts = 5;
                options.Lockout.AllowedForNewUsers = true;

                // User settings.
                options.User.AllowedUserNameCharacters =
                "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+";
                options.User.RequireUniqueEmail = true;

            })
             .AddEntityFrameworkStores<SnContext>()
             .AddDefaultTokenProviders();

            services.ConfigureApplicationCookie(options =>
            {
                // Cookie settings
                options.Cookie.HttpOnly = true;
                options.ExpireTimeSpan = TimeSpan.FromMinutes(5);

                options.LoginPath = "/Identity/Account/Login";
                options.AccessDeniedPath = "/Identity/Account/AccessDenied";
                options.SlidingExpiration = true;
            });

add to AuthorizeAdminFolder

 services.AddMvc()
                    .AddRazorPagesOptions(options =>
                    {
                        //options.Conventions.AuthorizeFolder("/Account/Manage");
                        //options.Conventions.AuthorizePage("/Account/Logout");
                        options.Conventions.AuthorizeAreaFolder("admin", "/ProjectsPages");
                    });

add this to configur in strartup.cs

  app.UseAuthentication();
            app.UseAuthorization();

add to projectContext in modelProject

public class ApplicationUser : IdentityUser
    {
        [Display(Name = "First Name")]
        public string FirstName { get; set; }
        [Display(Name = "Last Name")]
        public string LastName { get; set; }
        [Display(Name = "Date of birth")]
        public DateTime BirthDate { get; set; }
    }
    public class SnContext :IdentityDbContext<IdentityUser>
    {
        public SnContext(DbContextOptions<SnContext> option):base (option){}
}