DropDownList in ASP.NET Gridview Not Saving Changes Made During UPDATE

I've taken a gridview and replaced several of the fields with dropdownlists.

The Gridview is bound to a SQLDataSource and the dropdownlists are bound to a different SQLDataSource.  Generally I autoload all of the lookup table values into a dataset on page_load and bind my controls to the specific tables in the dataset.  The problem I'm having is because the ddls are inside of the gridview and I can't figure out why the selectedvalue  isn't being saved when I click on the UPDATE button.  It's wasn't originally throwing an exception it's just wasn't saving.  Now it's throwing an exception stating it "Cannot insert the value NULL".  Column does not allow nulls.

Where should I begin troubleshooting this?
MariyamAsked:
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duttcomConnect With a Mentor Commented:
Ideally, you should have placed the ddls for editing the data inside an EditTemplateItem inside a template field in the Gridview.

This is a good walkthrough of implementing ddls in a gridview for editing -

http://msdn.microsoft.com/en-us/library/ms178294(v=vs.80).aspx
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MariyamAuthor Commented:
The link you referenced is the exact one I used for testing - the problem for me seems to be that since the data that populates the ddls comes from tables different than the gridview sqlds table.

I got it working in 2005, but still no go on 2010.  I'm going to go ahead and complete the framework in 2005 and once it's table see about what advantages vs2010 offers (like AJAX for example).

Thanks so much.
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