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Databound dropdown list inside detailsview filtered dependent on selected radiobuttonlist item

Posted By:      Posted Date: October 19, 2010    Points: 0   Category :ASP.Net

It's driving me mad.  I have a detailsview bound to an sqldatasource. One of the items on the data table is to get its value from a dropdown list, so I created a template field and entered a dropdownlist, then bound that to a second datasource with the selection values in it. As the values can be male or female related, I have an unbound radiobuttonlist above the dropdownlist with two values - male or female - retunring an d"m" or an "f" and I want to use this to filter the records coming from the second data source for the dropdownlist.

I can't use a normal SQL control parameter on the datasource as the selector (the male/female radiobuttons) are in the detailsview and therefore "invisible".  I set up a normal control parameter with "none" as the type.  I then set the "autopostback" value to "true" for the male/female radio buttons and tried writing in the code-behind for the "maleorfemale_SelectedIndexChanged" event and using debug lines revealed that I was getting the "m" or "f" I needed by using "findcontrol", so that's fine.

I also tried adding in the "selecting" event for the second datasource to use the value of the radiobutton item, but although the "selecting" event fires

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