public void DelChild(string id)
{
IEnumerable <BE.Contract> contract = dimp.SearchContract(x => x.ChildID == id);
if (contract != null)
{
throw new Exception("canot delete this child you have to remove this contract :" + contract.Last().ContractCode);
}
dimp.DelChild(dimp.SearchChild(x => x.ChildId == id).Last());
}