// Fig. 10.4: CommissionEmployee.cs
// CommissionEmployee class represents a commission employee.
public class CommissionEmployee : object
{
   private string firstName;
   private string lastName;
   private string socialSecurityNumber;
   private decimal grossSales; // gross weekly sales
   private decimal commissionRate; // commission percentage

   // five-parameter constructor
   public CommissionEmployee( string first, string last, string ssn,
      decimal sales, decimal rate )
   {
      // implicit call to object constructor occurs here
      firstName = first;
      lastName = last;
      socialSecurityNumber = ssn;
      GrossSales = sales; // validate gross sales via property
      CommissionRate = rate; // validate commission rate via property
   } // end five-parameter CommissionEmployee constructor

   // read-only property that gets commission employee's first name
   public string FirstName
   {
      get
      {
         return firstName;
      } // end get
   } // end property FirstName

   // read-only property that gets commission employee's last name
   public string LastName
   {
      get
      {
         return lastName;
      } // end get
   } // end property LastName

   // read-only property that gets 
   // commission employee's social security number
   public string SocialSecurityNumber
   {
      get
      {
         return socialSecurityNumber;
      } // end get
   } // end property SocialSecurityNumber

   // property that gets and sets commission employee's gross sales
   public decimal GrossSales
   {
      get
      {
         return grossSales;
      } // end get
      set
      {
         grossSales = ( value < 0 ) ? 0 : value;
      } // end set
   } // end property GrossSales

   // property that gets and sets commission employee's commission rate
   public decimal CommissionRate
   {
      get
      {
         return commissionRate;
      } // end get
      set
      {
         commissionRate = ( value > 0 && value < 1 ) ? value : 0;
      } // end set
   } // end property CommissionRate

   // calculate commission employee's pay
   public decimal Earnings()
   {
      return commissionRate * grossSales;
   } // end method Earnings

   // return string representation of CommissionEmployee object
   public override string ToString()
   {
      return string.Format( 
         "{0}: {1} {2}\n{3}: {4}\n{5}: {6:C}\n{7}: {8:F2}",
         "commission employee", FirstName, LastName,
         "social security number", SocialSecurityNumber,
         "gross sales", GrossSales, "commission rate", CommissionRate );
   } // end method ToString
} // end class CommissionEmployee


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