What about this:
<CustomAction Id="PROPCA_SetCToA" Value="[A]" Property="C"/>
<CustomAction Id="PROPCA_SetCToB" Value="[B]" Property="C"/>
somewhere in InstallUISequence
<Custom Action="PROPCA_SetCToA">(NOT A) OR (A = '')</Custom>
<Custom Action="PROPCA_SetCToB">(NOT B) OR (B = '')</Custom>
HTH
Milan
José Escrich napsal(a):
>
> Hi,
> I have 2 properties A and B which has some registry values. What I
> want is set a value for a property C using something like a condition
> evaluating the values of A and B.
>
> Basically, what i want i set the value of A or B in the C property if
> any of those is blank or empty.
>
> thanks!!
>
>
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