how to save data in child table

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ASP.NET

LINQ

entity-framework

Dear Friends,

Suppose I am having Database with two table eg. sc_Order And sc_OrderDetails

first i want to store data in sc_Order and then into sc_OrderDetails and these two table have 1 to many relation
sc_Order(1)------>(*)sc_OrderDetails

first add data to sc_Order and add OrderDetails to ICollection<sc_orderdetails>

public partial class sc_Order
   {
       public sc_Order()
       {
           this.sc_Dispatch = new HashSet<sc_Dispatch>();
           this.sc_OrderDetails = new HashSet<sc_OrderDetails>();
       }
.................
.................
 public virtual ICollection<sc_OrderDetails> sc_OrderDetails { get; set; }
}

then i want to store ICollection<sc_orderdetails> items into sc_OrderDetails Table

how to store.....

please give me solution
Thanks in Advance.