cryo75

public class Nested
{
    public int Property1 {get;set;}
    public string Property2 {get;set;}
}

public  class Model
{
    public int Id { get; set; }
    public int ParentId { get; set; }

cryo75

public class UserModel
{
    public virtual CategoryModel Category { get; set; }
    public virtual UserGroupModel Group { get; set; }
}

public class CategoryModel
{
    public CategoryModel Category { get; set; }
}