C#

public class BaseApplication
{
    public bool FirstName { get; set; }
    public bool LastName { get; set; }

    public virtual void Save()
    {
        // write first name and last name to database
    }
}

public class StudentApplication : BaseApplication
{
    public bool SupportNeeds { get; set; }

    public override void Save()
    {
        base.Save();

        // write support needs to database
    }
}

?? app;
switch (courseType)
{
    case "31":
        app = new StudentApplication();
        break;
    case "32":
        app = new AdultApplication();
        break;
}

app.FirstName = FirstName.Text;
app.LastName = LastName.Text;
app.SupportNeeds = SupportNeeds.Text;

app.Save();