Total for the detail

HI guys, I am trying to get the total for a detail. I want sum of NonScan codes only

The code below gives me #error

Sum(IIF (Fields!Class5Code.Value="NonScan", Fields!CURRENT_WEEK_DAILY_DRAW.Value,0 ))

The code below gives the grand total of all codes irrespective of NonScan code

IIF (Fields!Class5Code.Value="NonScan",sum(Fields!CURRENT_WEEK_DAILY_DRAW.Value),0 )

PLease help me with code. Thanks in advance.

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svk