oap_labs/models/IDataProvuder.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static wpf_listbox.models.Globals;
using System.Threading.Tasks;
using System.Collections.Generic;
using wpf_listbox;
using wpf_listbox.models;

namespace wpf_listbox.models
{

    interface IDataProvider
    {
        IEnumerable<People> getPeople();
        IEnumerable<PeopleGender> getGender();
        IEnumerable<PeopleAge> getAge();
        IEnumerable<PeoplePlace> getPlace();
    }

    class Globals
    {
        public static IDataProvider dataProvider;


    }
}