How to get EA to remember value of variable from one tick to next

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Hi I'm trying to get an expert adviser to remember the highest ask or bid value as an order goes along with some code like this:

if(Bid>HPriceB && OrderType()==OP_BUY && OrderMagicNumber()==1)
{
HPriceB=Bid;
}

But it seems every time it reruns the adviser with each tick , it forgets the value of HPriceB and resets it to zero. What do I do to get it to remember the value?
 
define variable in the global scope. Read "MQL4: Global variables"
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