public void ApproveAssignment(string AssignmentId, string feedback)
        {
            bool redo  = false;
            int  limit = 10;
            int  count = 0;

            do
            {
                try
                {
                    client.ApproveAssignment(AssignmentId, feedback);
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.InsufficientFundsException)
                {
                    Console.WriteLine("NoT Enough Funds!!!");
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.InvalidParameterValueException)
                {
                    Console.WriteLine("Invalid Parameter Value!!!");
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.AccessKeyException)
                {
                    Console.WriteLine("Invalid Access Key Exception!!!");
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.InvalidTransportEndpointException)
                {
                    Console.WriteLine("Invalid Transport end point!!!");
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.ObjectDoesNotExistException)
                {
                    //Console.WriteLine(e.ToString());
                    Console.WriteLine(AssignmentId + " does not exist in Amazon");
                    return;
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.InvalidStateException)
                {
                    //Console.WriteLine(e.ToString());
                    Console.WriteLine(AssignmentId + "already approved");
                    return;
                }
                catch (Amazon.WebServices.MechanicalTurk.Exceptions.ServiceException)
                {
                    redo = true;
                    count++;
                }
            } while (redo && count < limit);
        }