Back Test and Real Account

[kenanah]

How I can insure my expert not read the historical data I mean when I traded on past time ex in 2008 on real account we get same result account on real account and back test same .      

[William Roeder]

1. Makes no sense. You "insure" by not coding it to "read the historical data."
   
2. Makes no sense. You can't trade in 2008 on a real account. No time-travelers here.
3. You will never get the same results live vs backtest. The spread varies (backtest doesn't.) There is slippage on open and exit, (none in backtest.) Etc.