❔ Razor pages asp-validation-for="MyProperty " vs asp-validation-summary="All"

 public class InputModel
{

    [Required(AllowEmptyStrings = false)]
    public string FirstName { get; set; }

    [Required(AllowEmptyStrings = false)]
    public string LastName { get; set; }

    [Required]
    [EmailAddress]
    public string Email { get; set; }

    [Required]
    [DataType(DataType.Password)]
    public string Password { get; set; }
}

public async Task<IActionResult> OnPostAsync()
{
    // only try adding user if attribute validation passes
    if (ModelState.IsValid)
    {
        // ... try adding new user to db
        if (result.Succeeded)
        {
          // ... other work
        }
        else
        {
            // ... check if failed due to existing user
            if (duplicateAccountError)
                ModelState.AddModelError(nameof(InputModel.Email), "Email already exists.");
        }
    }

    return Page();
}