ValidationResult Structure

/// <summary> 
/// Changes the user-default PrintTicket setting of the specified print queue. 
/// </summary> 
/// <param name="queue">the printer whose user-default PrintTicket setting needs to be changed</param>
static private void ChangePrintTicketSetting(PrintQueue queue)
{
    // 
    // Obtain the printer's PrintCapabilities so we can determine whether or not 
    // duplexing printing is supported by the printer. 
    //
    PrintCapabilities printcap = queue.GetPrintCapabilities();

    // 
    // The printer's duplexing capability is returned as a read-only collection of duplexing options 
    // that can be supported by the printer. If the collection returned contains the duplexing 
    // option we want to set, it means the duplexing option we want to set is supported by the printer, 
    // so we can make the user-default PrintTicket setting change. 
    // 
    if (printcap.DuplexingCapability.Contains(Duplexing.TwoSidedLongEdge))
    {
        // 
        // To change the user-default PrintTicket, we can first create a delta PrintTicket with 
        // the new duplexing setting. 
        //
        PrintTicket deltaTicket = new PrintTicket();
        deltaTicket.Duplexing = Duplexing.TwoSidedLongEdge;

        // 
        // Then merge the delta PrintTicket onto the printer's current user-default PrintTicket, 
        // and validate the merged PrintTicket to get the new PrintTicket we want to set as the 
        // printer's new user-default PrintTicket. 
        //
        ValidationResult result = queue.MergeAndValidatePrintTicket(queue.UserPrintTicket, deltaTicket);

        // 
        // The duplexing option we want to set could be constrained by other PrintTicket settings 
        // or device settings. We can check the validated merged PrintTicket to see whether the 
        // the validation process has kept the duplexing option we want to set unchanged. 
        // 
        if (result.ValidatedPrintTicket.Duplexing == Duplexing.TwoSidedLongEdge)
        {
            // 
            // Set the printer's user-default PrintTicket and commit the set operation. 
            //
            queue.UserPrintTicket = result.ValidatedPrintTicket;
            queue.Commit();
            Console.WriteLine("PrintTicket new duplexing setting is set on '{0}'.", queue.FullName);
        }
        else
        {
            // 
            // The duplexing option we want to set has been changed by the validation process 
            // when it was resolving setting constraints. 
            //
            Console.WriteLine("PrintTicket new duplexing setting is constrained on '{0}'.", queue.FullName);
        }
    }
    else
    {
        // 
        // If the printer doesn't support the duplexing option we want to set, skip it. 
        //
        Console.WriteLine("PrintTicket new duplexing setting is not supported on '{0}'.", queue.FullName);
    }
}