Nullable long : Nullable « Data Type « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Data Type
3. Nullable

using System;

public class Employee
{
    public Employee( string Name ) {
        this.firstName = firstName;
        this.terminationDate = null;
        this.ssn = default(Nullable<long>);
    }

    public string firstName;
    public Nullable<DateTime> terminationDate;
    public long? ssn; 
}

public class MainClass
{
    static void Main() {
        Employee emp = new Employee( "A");
        emp.ssn = 1234567890;

        Console.WriteLine( "{0} {1}", emp.firstName);
        if( emp.terminationDate.HasValue ) {
            Console.WriteLine( "Start Date: {0}", emp.terminationDate );
        }

        long tempSSN = emp.ssn ?? -1;
        Console.WriteLine( "SSN: {0}", tempSSN );
    }
}