Did you create the ADO connection using the correct bitism of 32-bit or 64-bit? If your application is built as target x86 then you need to use a 32-bit ADO connection, if it is x64 then it needs to be a 64-bit ADO connection. ADO connections do not currently work in projects whose target is anyCPU. For a test please create a brand new connection with a different name and see if that works. Thanks.
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