Conditionally counting detail field

Hello. I'm trying to conditionally count a field, for example:
iif(Fields!GrantCodeID.Value = 70, 1, 0)
GrantCode is a field and whenever it equals 70, I want to count it so
I can display the count after the detail.
Any help is much appreciated.
Thanks!=Sum(iif(Fields!GrantCodeID.Value = 70, 1, 0))
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"Michael" <mike1174@.comcast.net> wrote in message
news:dfd40822.0408181042.401a6798@.posting.google.com...
> Hello. I'm trying to conditionally count a field, for example:
> iif(Fields!GrantCodeID.Value = 70, 1, 0)
> GrantCode is a field and whenever it equals 70, I want to count it so
> I can display the count after the detail.
> Any help is much appreciated.
> Thanks!