Rule Definition
Having Thread.Sleep method in a loop in a transaction can increase greatly the time of execution and this is a great risk for the transaction. It can lead to transaction failure.

Remediation
Review the Function / Procedure design.

Violation Code Sample

static public void CreateTransactionScope()
    {
        try
        {
            // Create the TransactionScope to execute the commands, guaranteeing
            // that both commands can commit or roll back as a single unit of work.
            using (TransactionScope scope = new TransactionScope())
            {

                for (int i = 0; i < 5; i++)
                {
                    Console.WriteLine("Sleep for 2 seconds.");
                    Thread.Sleep(2000);
                }

                Console.WriteLine("Main thread exits.");


                // The Complete method commits the transaction. If an exception has been thrown,
                // Complete is not  called and the transaction is rolled back.
                scope.Complete();

            }

        }
        catch (TransactionAbortedException ex)
        {
            Console.WriteLine("TransactionAbortedException Message: {0}", ex.Message);
        }
        catch (ApplicationException ex)
        {
            Console.WriteLine("ApplicationException Message: {0}", ex.Message);
        }
    }

Fixed Code Sample

static public void CreateTransactionScope()
    {
        try
        {
            // Create the TransactionScope to execute the commands, guaranteeing
            // that both commands can commit or roll back as a single unit of work.
            using (TransactionScope scope = new TransactionScope())
            {
                // The Complete method commits the transaction. If an exception has been thrown,
                // Complete is not  called and the transaction is rolled back.
                scope.Complete();
            }
        }
        catch (TransactionAbortedException ex)
        {
            Console.WriteLine("TransactionAbortedException Message: {0}", ex.Message);
        }
        catch (ApplicationException ex)
        {
            Console.WriteLine("ApplicationException Message: {0}", ex.Message);
        }
    }

https://blogs.msmvps.com/peterritchie/2007/04/26/thread-sleep-is-a-sign-of-a-poorly-designed-program/ https://www.daniweb.com/programming/software-development/threads/459731/better-way-to-wait-than-thread-sleep-1-inside-a-loop