Error Calculating Percentages in SQL Reporting Services 2005 SP1

Hello Experts,
I have created a report in SSRS 2005 SP1 and I'm running into a problem evaluating the following expression:
=iif(Fields!xtndprce.Value=0,0,(Fields!xtndprce.Value-Fields!extdcost.Value)/Fields!xtndprce.Value)

When the report is built, the following error appears:
[rsRuntimeErrorInExpression] The Value expression for the textbox ‘textbox70’ contains an error: Attempted to divide by zero.

As you can see from the expression, I am making sure the denominator of my formula (Fields!xtndprce.Value) is not zero.  It seems as if SSRS is evaluating the "false" part of my expression regardless of whether the condition is true or false.  I have also tried "IsError" with the same results ("False" if Fields!xtndprce.Value<>0 and "#Error" if it is).

Thanks in advance.
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mikesauceAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
=iif(Fields!xtndprce.Value=0,0, iif(Fields!xtndprce.Value=0,0,(Fields!xtndprce.Value-Fields!extdcost.Value)/Fields!xtndprce.Value))
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mikesauceAuthor Commented:
Hi angelIII,
That didn't work either...same error message.
Thanks!
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
sorry, I pasted the wrong code :-(
please try this:
=iif(Fields!xtndprce.Value=0, 0, Fields!xtndprce.Value-Fields!extdcost.Value) / iif(Fields!xtndprce.Value=0, 1, Fields!xtndprce.Value)
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mikesauceAuthor Commented:
That worked.  Any idea on why RS looks trys to evaluate the second part of the iif statement regardless?  
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
"yes". I know that all microsoft database products work like this, they do NOT have the "C" programming manner to for example stop evaluation of a boolean OR expression as soon as they found true or a AND expression as soon as they found false. similary here, all expression parts are evaluated, despite of the "fact" that in some cases, some expressions evaluations are not needed.
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Microsoft SQL Server 2005

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