Custom code in SSRS

I am setting up code in the custom code area of report properties in SSRS 2008. I am having problems setting up the public function for two fields. I have to have one for pbm_propertyClass and one for pbm_TotalAssessment. I need the pbm_propertyClass to set up and If statement to see if it less than 710 and if so add the total to nonexempt field to use in a percentage calculation. Then if it less than 710 I willl need to set up a seperate function I believe. My problem is I don't know how to declare both virables in one public function statement.   Both of these virables are table fields in the dataset.  it gives me the following error when I try to view the report.  The definition of the report 'PropertyClass is invalid. There is an error on line 1 of custom code:[BC30205] End of statement expected.

' Non Eempt Property values
Public function PropClass(ByVal pbm_PropertyClass as Integer), nonexempt (byval pmb_totalAssessment as integer)



  ' Non Exempt property classes are less than 710
If pbm_PropertyClass < 710 
NonExempt = NonExempt + pbm_TotalAssessment
End if
End Function

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