I have a class for Validation which is:

public class PageValidation:ValidationAttribute
{
    private readonly string UserKey;
    private readonly HttpContext _context;
    public PageValidation(IHttpContextAccessor contextAccessor,string UserKey)
    {
        this.UserKey = UserKey;
        _context = contextAccessor.HttpContext;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var ActiveUserString = _context.Session.GetString("ActiveUserSession");
        var ActiveUser = JsonSerializer.Deserialize<UserModel>(ActiveUserString);

        if (ActiveUser.AuthCheck(UserKey)) return ValidationResult.Success;
        else throw new ApplicationException("Erişim yetkiniz yok!");
    }
}

And I want to call this from my controller which is:

 [PageValidation(null, "Company")]
    public IActionResult CompanyAndDepartments(string ViewType)

The problem is I cant send first parameter of PageValidation’s cunstructor correctly. As you see it is null and it gives me error.