Crystal Report, Function

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ASP.NET

CrystalReports

reporting

Hi All,

I make a crystal report formula field but it cannot work and it's always showing "0"

shared numbervar counter;
shared stringvar strRes;
local numbervar j;

FOR j := 1 TO COUNT({View_Department.ICNo}) STEP 1 DO
(
    local stringvar hyperstat := {View_Department.Hypertension}[j];
    if hyperstat = "Normal Blood Pressure" then counter := counter + 1;  
);

counter

In this code, what did I forget to put?
Please help me.