//extension method - a static method that can be invoked as an
//instance method of its first this qualified argument type
public static double GetIncomeTax(this ITaxPayer that, int age)
{
double ex = that.GetAnnualIncome() - 120000;
float tr = age < 60 ? 0.15f : 0.12f;
return(ex > 0 ? tr * ex : 0);
}
public Taxpayer(ITaxPayer tp)
{
TAXPAYER_ID = tp.TAXPAYER_ID;
CREATION_DATE = tp.CREATION_DATE;
FIRST_NAME = tp.FIRST_NAME;
MIDDLE_INITIAL = tp.MIDDLE_INITIAL;
LAST_NAME = tp.LAST_NAME;
SSN = tp.SSN;
}
public Task<AsyncResult> SaveTaxPayer(ITaxPayer taxPayer)
{
// comment
throw new NotImplementedException();
}
