It would be ideal if i can get the complete stack trace plus the query that you are executing here. You can also look into the oracle command that we are executing.
Here are the steps to reproduce:
In VS open Tools->Options->Debugging and switch 'Enable Just My Code' off.
Set a breakpoint at the operation that causes the error, run the application to that point.
Open Debug->Exception and switch on the checkbox for 'Common Language Runtime Exceptions'.
Now continue and you will stop in the OpenAccess code.
There is a variable 'command' or 'reader' that you can inspect now.To do so, open quick watch or just add the 2 variables to your watch window. You can see the sql statement plus the parameter collection.
Maybe you are able to see which parameter is not set.
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