Unable to set public properties on instance of C# Class

Question

I'm trying try to write my first NSpec test in a Mobile Service application. I created an attribute in the spec. But when I try to access that element on the next line I can't access the public properties on the instance because Visual Studio is not recognizing the variable.

AppointmentSpec.cs

public class AppointmentSpec : nspec
    {
        private AppointmentDTO _dto = new AppointmentDTO();
        _dto.PatientId = "124234"; // Visual Studio is not regonizing _dto

    }

AppointmentDTO.cs

public class AppointmentDTO
    {
        public string PatientId { get; set; }
       // public string PathwayId { get; set; }
        public string ItemId { get; set; }
        public string Subject { get; set; } //Dr. Visit, labtest, labtest name, follow up, other...
       // public string ProviderName { get; set; }
        public string Location { get; set; }  //clinic, hsopital name, etc
        public string Address { get; set; }  //street address
        public string PhoneNumber { get; set; }
        //to automatically add a corresponding appointment to the provider's calendar
        public bool SetProviderAppointment { get; set; }
        public string ProviderItemId { get; set; }
        public List<string> ProviderItemIds { get; set; } 
        public bool IsVideoCall { get; set; }
        public TimeSpan StartTime { get; set; }
        public TimeSpan EndTime { get; set; }

        public DateScheduleInfo EventDateSchedule { get; set; }

        //public TimeScheduleInfo EventTimeSchedule { get; set; }

        //public void Send(object target, string methodName, params object[] args)
        //{
        //    var properties = GetProperties(target.GetType());
        //    var property = properties.First(p => p.Name == methodName);
        //    if(property == null)
        //        throw new ArgumentException($"{target.GetType()} has no property or method ");
        //    property.SetValue(target, args.First());
        //}

        //private static IEnumerable<PropertyInfo> GetProperties(Type t)
        //{
        //    return t == null ? Enumerable.Empty<PropertyInfo>() : t.GetProperties().Union(GetProperties(t.BaseType));
        //}
    }

Answer 1

Do the assignment inside the constructor of the class:

public class AppointmentSpec : nspec
    {
        private AppointmentDTO _dto = new AppointmentDTO();

        public AppointmentSpec()
        {
            _dto.PatientId = "124234";
        }

    }