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[QUOTE="Cowboy \(Gregory A. Beamer\), post: 2879017"]
On the retrieving end
---------------------
You should input check for a null guid and not even try to retrieve data 
where it is null.Based on my reading of your code, this value should never 
be null.

Of course, another method is to return an empty dataset when it is null. To 
accomplish this, move your query to a stored procedure, where you can 
properly branch it (assuming this a database, like SQL Server, of course).

On the binding end
-------------------
Using a DataSet, you have a couple of choices.

1. Hack the DataSet itself and hack out the offending error. This is fine, 
with strings (for example), where you can supply a default of String.Empty. 
I would not do this with Guid.
2. Edit the binding event of the Data Grid and look for the null there, 
where you can supply an empty string for the cell instead, as everything is 
converted to string to output to the browser anyway.

If you do it this way, you can remove conditions where a user clicking 
something hits a null guid.
[/QUOTE]

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