protected string DisplayDaysOnJob(Northwind.EmployeesRow employee)
 {
     // Make sure HiredDate is not null... if so, return "Unknown"
     if (employee.IsHireDateNull())
         return "Unknown";
     else
     {
         // Returns the number of days between the current
         // date/time and hiredDate
         TimeSpan ts = DateTime.Now.Subtract(employee.HireDate);
         return ts.Days.ToString("#,##0");
     }
 }