Nulls in a Drop Down in Reporting Services
I was trying to figure out how to pass a null into a queried parameter, which renders as a drop down. The only solution I found, after looking around a bit, was from a forum post I made:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1789337&SiteID=1. The solution is to create a query that includes a null parameter, and a default message. I created a series of queries that included two values, one for the display and one for the underlying value. I did this even when the display/value were the same.