looping and adding

[NZ_Kiwis]

I have a variable $GrandTotal

Each time I look through a database I want to add to it

while ($row = $result.>fetch_assoc()){
$GrandTotal = $GrandTotal + $row['MyCount'];
}

This does not work, why?
How should I do it?

[Weedpacket]

Could it be the typo?
Is there a reason you're not doing the addition in the database query?
Could it be any one of a million other things that can't be ruled out because so little information has been given?