c# - Code Behind ASPX Page can see the Classes in AppCode but not their properties -

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my code behind can see classes in appcode file none of attributes/variables/properties of classes.

i have set classes compile. variables , classes public. have tried adding using 'project'.appcode top. incredibly frustrating.

i have copy pasted alot of code project ensure it's not configuration issue.

my code behind page can see classes. doesn't know of them have properties. instantiating new 1 uses blank constructor when there isn't one.

for example, within appcode folder customer class.

public class customer {     public string fname { get; set; }     public string lname { get; set; }     public string address { get; set; }     public string city { get; set; }     public province prov { get; set; }     public string pcode { get; set; }     public string email { get; set; }     public list<phonenumber> pnums { get; set; }     public list<pet> pets { get; set; }     public string efname { get; set; }     public string elname { get; set; }     public phonenumber epnum { get; set; }     public string eemail { get; set; }      public customer(string fname, string lname, string address, string city, province prov, string pcode, string email, list<phonenumber> pnums, list<pet> pets, string efname, string elname, phonenumber epnum, string eemail)     {         this.fname = fname;         this.lname = lname;         this.address = address;         this.city = city;         this.prov = prov;         this.pcode = pcode;         this.email = email;         this.pnums = pnums;         this.pets = pets;         this.efname = efname;         this.elname = elname;         this.epnum = epnum;         this.eemail = eemail;     }  }

in code behind can see , instantiate class, uses blank constructor. cannot view of public variables have declared.

customer customer = new customer(); customer.pets.add(new pet());

spits out error 

 "error 2   'project.customer' not contain definition 'pets' , no extension method 'pets' accepting first argument of type 'project.customer' found (are missing using directive or assembly reference?)"

you need initialize pet list customer. 

            customer customer = new customer();             customer.pets = new list<pet>();             customer.pets.add(new pet());

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