See if message #1001299 helps.

>I was wondering if anybody can recommend (if possible) to use two parameters with the property DataNavigateUrlFormatString? For example, if I want to use two fields in my link:
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>DataNavigateUrlFormatString="MyPage.aspx?Number1={0}Number2={1}"
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>The property DataNavigateUrlField can only have one value but maybe there is a trick to be able to plug another field value in the {1} expression (above).
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>Thank you in advance for any suggestions.