Entity Data Framework - Delete a record through the primary key. EntityKey (namespace System.Data)

In the following block code I'll show how to delete a record in the table Tbl_SpidBustaPaga through the primary key (ID_SpidBustaPaga):

 {          

   int ID_SpidBustaPaga = Convert.ToInt32(hid_ID_SpidBustaPaga.Value);                   

   ContraEntities contraEntityCtx = new ContraEntities(ConfigurationManager.ConnectionStrings["ContraCSEntities"].ToString());          

   var BustaPagaKey = new EntityKey("ContraEntities.Tbl_SpidBustaPaga", "ID_SpidBustaPaga", ID_SpidBustaPaga);         

   var contact = contraEntityCtx.GetObjectByKey(BustaPagaKey);          

   contraEntityCtx.DeleteObject(contact);          

   contraEntityCtx.SaveChanges();          

   }