public
abstract
class
BillingDetails
{
private
string
_id;
private
string
_owner;
public
BillingDetails()
{
}
public
BillingDetails(
string
id,
string
owner)
{
this
._id
=
id;
this
._owner
=
owner;
}
public
virtual
string
ID
{
get
{
return
this
._id; }
set
{
this
._id
=
value; }
}
public
virtual
string
Owner
{
get
{
return
this
._owner; }
set
{
this
._owner
=
value; }
}
}
public
class
CreditCard : BillingDetails
{
private
string
_number;
private
string
_expYear;
private
string
_expMonth;
public
CreditCard()
{
}
public
CreditCard(
string
id,
string
owner,
string
number,
string
month,
string
year)
:
base
(id, owner)
{
this
._number
=
number;
this
._expMonth
=
month;
this
._expYear
=
year;
}
public
virtual
string
Number
{
get
{
return
this
._number; }
set
{
this
._number
=
value; }
}
public
virtual
string
ExpMonth
{
get
{
return
this
._expMonth; }
set
{
this
._expMonth
=
value; }
}
public
virtual
string
ExpYear
{
get
{
return
this
._expYear; }
set
{
this
._expYear
=
value; }
}
}
