database - Can I create multiple associations between two entities in Entity Framework 5, c#? -

e.g. have 2 entities:

public class department {     public guid id { get; set; }     public string name { get; set; }     public icollection<employee> employees { get; set; }     public employee manager { get; set; } }  public class employee {     public guid id { get; set; }     public string fullname { get; set; }      [foreignkey("departmentid")]     public department department { get; set; }     public guid departmentid { get; set; }     public string position { get; set; } } 

i know can associate (as did:) department.employees employee.id (and inverse: employee.department department.id).

questions:
1) 1 or 2 associations?

2) can create second association between department.manager , employee.id? don' want store managers in table stored in employee table , have in position field "manager".

define relationship follows.

protected override void onmodelcreating(dbmodelbuilder modelbuilder) {     modelbuilder.entity<department>()         .hasrequired(a => a.manager)         .withmany()         .hasforeignkey(a => a.employeeid); } 

you want them virtual if want lazy loading , change tracking.

public class department {     public guid id { get; set; }     public string name { get; set; }     public virtual icollection<employee> employees { get; set; }     public virtual employee manager { get; set; } }