private void detach_DeptCosts(DeptCost entity)
 {
     this.SendPropertyChanging("DeptCosts");
     entity.Dept = null;
 }
 private void attach_DeptCosts(DeptCost entity)
 {
     this.SendPropertyChanging("DeptCosts");
     entity.Dept = this;
 }
 partial void UpdateDeptCost(DeptCost instance);
 partial void DeleteDeptCost(DeptCost instance);
 partial void InsertDeptCost(DeptCost instance);