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Every once in awhile, you come across this exception: System.
Regardless of what workflow is initiated, they all follow the same six steps: the firing of the appropriate pre-action event (, in the case of the updating workflow).
This is most common in classes where you are using class-wide instantiated objects.
If you create and drop your objects within each method, this isn’t going to be a problem, and you are actually following a better guideline by creating at the last necessary moment, and destroying at the first possible moment, not to mention avoiding possible exceptions like Invalid Reference Exception.
Again, same exception gets thrown, but coming from withing the instantiated class itself.
The Get Orders function inside of Customers requires an instance of a connection, but you disposed of the required objects required to access the database back up in Load Data() when you called a. Be careful when you clean up your instances, that you are not using them again somewhere.