public Customer GetBy(int id)
 {
     return(_dataBaseTransaction.GetById <Customer>(item => item.Id == id));
 }
 public Company GetBy(int id)
 {
     return(_dataBaseTransaction.GetById <Company>(item => item.Id == id));
 }
 public Invoice GetBy(int id)
 {
     return(_dataBaseTransaction.GetById <Invoice>(item => item.Id == id));
 }
 public Item GetBy(int id)
 {
     return(_dataBaseTransaction.GetById <Item>(item => item.Id == id));
 }