ASP GridView and SqlDataSource?

How do I pass on 2 Codes to the next page upon clicking the hyperlink which is in the GridView. I can only pass on 1 but I want to pass on 2.

The hyperlink properties is something like this:

[-] Data
DataNavigateUrlFields | ProductCode
DataNavigateUrlFormatString | AddOrder.aspx?ProductCode={0}
DataTextField | ProductCode

I want 2 primary keys to be passed on to the next page which are ProductCode and SalesCode but based on the properties above, only Product Code is passed on.

How do I correct this?
 
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