sql - calculation shows NaN error -

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in visual studio report have sum of 2 textboxes when calculated shows 'nan'. reason because calculation projects 0. 

 simple calculation textbox 1 / textbox 2.

is there way can code show 0.00 or show blank instead of nan when type of project selected drop down parameters?

i cannot have seperate report different prioject types linked same overall totals.

any advice appreciated.

change formula iif statement evaluate 2 textboxes. need make sure both numeric , divisor not zero. if of true, set value 0.00 else calculation.


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