c# - Should I use a collection of Users or user in a certain class inMVC4 -

i have department filled users in eg mark in hr department , james in hr department etc

i'm wondering use

public virtual icollection users { get; set; }

or

public virtual user user { get; set; }

for department , depot classes same?

 public class department     {         public int departmentid { get; set; }          [stringlength(50, minimumlength = 3)]         public string name { get; set; }          [display(name = "administrator")]         public int userid { get; set; }          public virtual icollection<user> users { get; set; }     } 

can check if did these few lines correctly in user class(you can reference below)

    public virtual icollection<ticket> tickets { get; set; } <-users can have collection of tickets because can open many tickets want.        public virtual administrator administrator { get; set; } <- 1 user can 1 type of admin @ time     public virtual department department { get; set; } <- 1 user can @ 1 department in @ time     public virtual depot depot { get; set; } <- 1 user can @ 1 depot time 

this entity diagram

user class

    public class user     {         public int userid { get; set; }         [stringlength(50, minimumlength = 1)]         public string lastname { get; set; }         [stringlength(50, minimumlength = 1, errormessage = "first name cannot longer 50 characters.")]         [column("firstname")]         public string firstmidname { get; set; }         [datatype(datatype.date)]         [displayformat(dataformatstring = "{0:yyyy-mm-dd}", applyformatineditmode = true)]         public datetime enrollmentdate { get; set; }          public int depotid { get; set; }         public int departmentid { get; set; }         public int ticketid { get; set; }           public string fullname         {             { return lastname + ", " + firstmidname; }         }           public virtual icollection<ticket> tickets { get; set; }             public virtual administrator administrator { get; set; }         public virtual department department { get; set; }         public virtual depot depot { get; set; }     } } 

yeah should use department because it'll contain collection of users.