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// Object users can only get the value, however

// the Employee class and derived types can set the value.

public string SocialSecurityNumber

{

get { return empSSN; }

protected set { empSSN = value; }

}

In this case, the set logic of SocialSecurityNumber can only be called by the current class and

derived classes and therefore cannot be called from an object instance. Again, the protected

keyword will be formally detailed in the next chapter when we examine inheritance and poly-

morphism.

Read-Only and Write-Only Properties

When encapsulating data, you may wish to configure a read-only property. To do so, simply omit the

set block. Likewise, if you wish to have a write-only property, omit the get block. For example, here

is how the SocialSecurityNumber property could be retrofitted as read-only:

public string SocialSecurityNumber

{

get { return empSSN; }

}

Given this adjustment, the only manner in which an employee’s US Social Security number can

be set is through a constructor argument. Therefore it would now be a compiler error to attempt to

set an employee’s SSN value as so:

static void Main(string[] args)

{

Console.WriteLine("***** Fun with Encapsulation *****\n");

Employee emp = new Employee("Marvin", 24, 456, 30000, "111-11-1111");

emp.GiveBonus(1000);

emp.DisplayStats();