c# - cannot implicitly convert type 'int?' to system.collection.generic.IEnumerable -

i making small demo in asp.net have created 1 abstract class , implemented in dal, have created poko classes when calling of few properties getting error. here code :

    public class personpoko {     public int id { get; set; }     public string name { get; set; }     public int? age { get; set; }     public gender gender { get; set; } //assigning gender of type enum     public string address { get; set; }     public ienumerable<country> countryid { get; set; }//this dropdownlist } public class country //created class fetch dropdownlist records database {     public int id { get; set; }     public int? countryid { get; set; }     public string countryname { get; set; } } public enum gender {     m,     f } 

personabstract.cs

    public abstract class personabstract {     public abstract ienumerable<personpoko> getallperson();     public abstract bool addperson(personpoko pk);     public abstract bool updateperson(personpoko pk, int id);     public abstract bool deleteperson(personpoko pk, int id); } 

here getting error in dal persondal.cs

    public class persondal: personabstract,idisposable {      public void dispose()     {         db = null;         db.dispose();     }        public ienumerable<personpoko> getallpersons()     {         return db.procgetallpersons()                  .asenumerable()                  .select((letpersonpokoobj)=>new personpoko()                  {                      id=letpersonpokoobj.id,                      name=letpersonpokoobj.name,                      age=letpersonpokoobj.age,                      gender=letpersonpokoobj.gender,//here getting error,how call enum. in database have given gender char(1)                      address=letpersonpokoobj.address,                      countryid=letpersonpokoobj.countryid//here getting error, cannot implicitly convert type 'int?' system.collection.generic.ienumerable                  })      } } 

can tell me making mistake ? appreciated