There is already an open DataReader associated with this Connection which must be closed first?

You're not disposing of your objects, which basically means that your previous call to getAllConseillers, or a similar method, opened a data reader that is still open.

Don't try to separate the connect with the get data. The call to Open may in-fact not go to the database at all and you will not detect issues at that point. Note the using statement to close the connection.

Add SEH as required.

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