NCalc expression with more than one line possible?

I've written the following code:

if( [DeltaToSessionBest] > 0, 1, if( [DeltaToSessionBest] < 0, 2, 0 ) )

This code works, but I always have to go into the game to test that my code is doing it right.

To test the code without switching all the time to the game, I've tried the following code:

deltatemp = [DeltaToSessionBest]
if( [deltatemp] > 0, 1, if( [deltatemp] < 0, 2, 0 ) )

I get the error "Expression error:missing EOF at 'if' at line 2:0"

Why do I want to do this? I change the code to:

deltatemp = 10
if( [deltatemp] > 0, 1, if( [deltatemp] < 0, 2, 0 ) )

Now I can run the dashboard within Dash Studio and see the result if the value is 10. Or I can test negative values:

deltatemp = -10
if( [deltatemp] > 0, 1, if( [deltatemp] < 0, 2, 0 ) )

But I can't get rid of the error "missing EOF". What ist the delimiter in NCalc for the next line?

And how can I use variables inside my NCalc code? Is "deltatemp = 10" the correct way?

I've searched inside this forum and also the internet. But I haven't found any example for NCalc code with more than one line.