private DataProvider()
 {
     Companies    = new CompanyRepository();
     Addresses    = new AddressRepository();
     Accounts     = new AccountRepsitory();
     Employees    = new EmployeeRepository();
     Transactions = new TransactionRepository();
 }
 private DataProvider()
 {
     Companies = new CompanyRepository();
     Addresses = new AddressRepository();
     Accounts = new AccountRepsitory();
     Employees = new EmployeeRepository();
     Transactions = new TransactionRepository();
 }