I am trying to see if a particular dynamic variable is defined... but having trouble 
building the ifDefined argument.

Form.SerNum1
Form.SerNum2
Form.SerNum3 ...etc. are built dynamically and then passed to an action form below 
like below.

<-cfloop index="i" from="1" to="#theSerNums.RecordCount#">
        <-cfif isDefined("Form.SerNum#i#")>
                DoSomething
        <-cfelse>
                DoSomethingElse
        <-/cfif>
<-/cfloop> 

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