How add value foreign key refferenced column in entity frame work 6

<b></b>hi all,

I am working on a class file that uses entity framework 6,

   I have two object files
   roles.cs and task.cs

   role.cs is like
<pre lang="cs">public partial class Role
    {
        public Role()
        {
            this.Tasks = new HashSet&lt;Task&gt;();
            this.Users = new HashSet&lt;User&gt;();
        }

        public int RoleID { get; set; }
        public string RoleName { get; set; }

        public virtual ICollection&lt;Task&gt; Tasks { get; set; }

    }</pre>
 task.cs is like

<pre lang="cs">public partial class Task
   {
       public Task()
       {
           this.Users_Tasks = new HashSet&lt;Users_Tasks&gt;();
           this.Roles = new HashSet&lt;Role&gt;();
       }

       public int TaskID { get; set; }
       public string TaskName { get; set; }
       public string TaskDescription { get; set; }


       public virtual ICollection&lt;Role&gt; Roles { get; set; }
   }</pre>


   I want add task to role ,
   please help me,
   thanks and regards