Cancel-optimization-backtest-run-of-a-strategy-from-C-code

Hello,
I want to skip some of parameter combinations in my optimization backtest process.
On forum there is a post regarding cancelling the strategy run - https://www.wealth-lab.com/Discussion/Cancel-strategy-run-programmatically-7205
So I wrote this code to skip some parameter values from optimizing:

CODE:

public override void BacktestBegin()
{
     var a = Parameters[0].AsDouble;
     var b = Parameters[1].AsDouble;
     if (a > b)
     {
         throw new Exception("Canceled");
     }
}

And this code doesn't cancel the backtest strategy run... It continues.
Are there any other way to cancel an optimization of unwanted parameter combinations?
Thank you